I went through this project a couple of years ago. Here's what I came up with:

Class 1 Flute Solos
Sonata III - Handel (mvts 1 & 2)
Sonata IV - Handel (mvts 1 & 2)
Sonata VI - Handel (mvts 1, 2 & 3)
Sonata IV - Bach (mvts 1 & 2 or 2 & 3)
Concerto in G Major - Quantz (1st or 3rd mvmt)
Concerto No. 1 in G Major - Mozart (mvt 1 or 3)
Ballade - Perlihou
Syrinx - Debussy (This requires a VERY good counter - also its unaccompanied)
Twelve Fantasies for Flute - Telemann (unaccompanied, play one entire fantasy)
Three Romances - Schumann (any 2 mvts)
Concertino - Chaminade

Class 2 Flute Solos
Sicilienne - Faure (comes from a book called "24 short concert pieces" - kids love it, sounds like harry potter)
Siciliano - Bach
Telemann Suite in a minor - (class 1 or 2, mvt 2, 3 or 7 is a class 2, overture is a class 1)
Sonata II - Handel (play 2 consecutive mvts)
Sonata V - Handel (play 2 consecutive mvts)
Bourree (from Third Cello Suite) - Bach/Dishinger
Second Minuet de L'Arlesienne - Bizet/Cavally (24 Short Concert Pieces)
Suite (from Variations for Violin on Themes of Tartini) - Corelli/Dishinger
Suite in Bb - Corelli/Maganini (2 contrasting mvts)
Sonata in G - Finger
Alleluja (from Exultate, Jubilate) - Mozart/Voxman/Block
Suite in b minor - Bach (Play Badinerie, Rondeau & Minuett, or Bourree & Minuett)
Adagio and Gigue - Loeilelt/Moyse (Flute Music of the Baroque)

Class 3 Flute Solos
Menuet in G - Bach/Dishinger
Gavotte (from Symphony No. 4) - Boyce/Vedeski
Ballet of the Shepherds - von Gluck/Guenther (Flute Solos Level 2)
Allegro (from Concerto Grosso) - Handel/Dishinger
Menuett - Kuhlau
Menuett Paysanne - Mozart
Gavotte (from Don Juan) - Gluck
Little Jig - Bach Guenther (Flute Solos, Level 2)
Melody (from Don Giovanni) - Mozart/Guenther (Flute Solos, Level 2)
Spanish Folk Song - Guenther (Flute Solos, Level 2)

Class 1 Oboe Solos
Album of Five Pieces - Debussy (play any one, Reverie is the most playable)
Concerto Grosso No. 8 in Bb - Handel (play mvts 1 & 2)
Sonata No. 2 in g minor - Handel/Arnold (play mvts 1 & 2) (Oboe Solos)
Sonata No. 3 in F - Handel/Arnold (play mvts 1 & 2) (Oboe Solos)
Concerto in f minor - Telemann (play mvts 1 & 2 or 2 & 3)
Elegaic Dance and Presto - Head (play both for class 1, play either one for class 2)

Class 2 Oboe Solos
from Concert and Contest Collection:
*Sinfonia - Bach/Voxman
*Two Minuettos - Bach/Voxman
*Menuetto and Presto - Haydn/Voxman
*Piece in g minor - Pierne
*Andante and Allegro - Loeillet/Voxman
Song of India - Rimsky-Korsakov/Jaeger
Gavotte (from Symphony No. 4) - Boyce/Vedeski
Gavotte - Gossec/Johnson

Class 3 Oboe Solos
Menuet in G - Bach/Dishinger
Musette - Bach/Dishinger
Polovetsian Dance - Borodin/Foster
Allegro from Concerto Grosso, Op. 3, No. 4 - Handel/Dishinger
Gavotte in Rondeau - Lully/Post
Gavotte (from Harpsichord Suite No. 5) - Purcell/Vedeski
Gavotte and Hornpipe - Purcell/Dishinger

Class 1 Bassoon Solos
Es ist Vollbracht - Bach/Schoenbach (Solos for the Bassoon Player)
Suite - Corelli/Dishinger
Variations on a Theme of Robert Schumann - Davis
Sicilienne, Op. 78 - Faure/Davis
Six Sonatas - Galliard (play 3 mvts from one Sonata)
Sonata in f minor - Telemann (mvts 1 & 2 or 3 & 4)
Sonata No. 3 in a minor - Vivaldi (play 2 contrasting mvts)
Sonata in a minor - Marcello

Class 2 Bassoon Solos
Bourree I and II - Bach/Schoenbach (Solos for the Bassoon Player)
Bolero - Berlioz/Dishinger
Entr'acte from Carmen - Bizet/Schoenbach (Solos for the Bassoon Player)
The Earle of Oxford's Marche - Byrd/Dishinger
March of a Marionette - Gounod/Walters
Largo and Allegro - Marcello/Merriman
Gavotte and Hornpipe - Purcell/Dishinger
Medici Masterworks, Vol. 1 - Dishinger (play any two)
Polovetsian Dances - Borodin/Buchtel
Three Pieces from Album for the Young - Schumann

Class 3 Bassoon Solos
Medici Masterworks, Vol. 1 - Dishinger (Play any one)
Menuet in G - Bach//Dishinger
Musette - Bach/Dishinger
Allegro from Concerto Grosso Op. 3, No. 4 - Handel/Dishinger
Cantilena - Handel
Minuet - Marpurg/Dishinger
The Happy Hunter - Paine
Asleep in the Deep - Petrie
Highland Heather - Siennicki
Gavotte (from Harpsichord Suite No. 5) - Purcell/Dishinger

Class 1 Clarinet Solos
Selanka, Fibich
Sonata I, LeFevre
Five Bagatelles, Finzi (Play mvt 1 or 5 plus one other)
Fantasy Pieces, Op. 73, Schumann (any 2 mvts)
Long Long Ago, Ritter/Shanley
First Sonata Op. 120, No. 1 - Brahms (play mvt 1 or any two from 2, 3 or 4)
Second Sonata Op. 120, No. 2 - Brahms (play mvts 1 or 3)
Andante and Allegro Op. 102 - leFevre/Calliet (play one mvt)
Concerto in Bb K. 622 (play any mvt)
Introduction, Theme and Variations - von Weber
Clarinet Concerto in Bb Major - Stamitz/Smith (play mvt 1 or 3)

Class 2 Clarinet Solos
Sonata V - Handel/Ramsay (any 2 mvts)
Waltz Fantasy - Mozart/Waln
Suite in Bb - Corelli (2 contrasting mvts)
Alleluja from Exsultate, Jubilate - Mozart/Voxman
Alleluia from Exsultate, Jubliate - Mozart/Heim (easier arrangment than the Voxman)
Allegretto, Mozart/Dishinger
Divertimento in Bb, Mozart/Bellison (any 2 mvts)
A Wessex Pastorale, Stocks/Bonade
Solo from String Quartet, Mozart/Willaman
Piece in g minor - Pierne
Theme and Variations, Haydn/Kaplan
Air and Courante, Lully/Kaplan
La Villageoise - Rameau/Scarmolin

Class 3 Clarinet Solos
Menuet in G - Bach/Dishinger
Ancient Minuet - Amani/Hite
Five Bagatelles - Finzi (play Carol)
Allegro from Concerto Grosso, Op. 3 No. 4 - Handel/Dishinger
Chanson Moderne - Hovey/Leonard
Clouds in Summer - Hovey/Leonard
Minuetto - Hovey/Leonard
Chrysalis - Langenus
Gavotte in Rondeau - Lully/Post
Menuet - Marpurg/Dishinger
Gavotte and Hornpipe - Purcell/Dishinger

Class 1 Bass Clarinet Solos
Adagio and Allegro - Galliard/Merriman
Andante and Allegro - Desportes
Long Long Ago, Fantasie Op. 12 - Ritter/Shanley
Two Rags - Dykstra (play one mvt)
Ballade - Bozza
Nocturne - Verrall

Class 2 Bass Clarinet Solos
Largo and Allegro - Boni/Voxman
Orientale - Cui
Gavotte from Symphony No. 4 - Boyce/Vedeski
Andante and Bourree - Handel/Ayres
Largo and Bourree - Handel/Merriman
Aquamarine - Karel
The Buffoon - Koepke
From Concert and Contest Collection:
*Romance and Troika - Prokofiev/Hummel/Voxman
*Sarabande and Bourree - Bach/Hervig/Voxman
*Largo and Allegro - Loeillet/Voxman
*Mosaic - Walthrew/Voxman
*Two Russian Pieces - Kalinikoff/Voxman

Class 3 Bass Clarinet Solos
Menuet in G - Bach/Dishinger
Musette - Bach/Dishinger
Two Hungarian Songs - Bartok/Porter
Brahms Variations - Brahms/Goldberg
Novelette - Erickson/Goldberg
Bouree and Menuet - Hasse/Ayres
Asleep in the Deep - Petrie/Buchtel
Deep River - Weber
Rigaudon from Pieces de Clavecin - Rameau/Dishinger
Gavotte in Rondeau - Lully/Post

Class 1 Alto Sax Solos
Three Romances - Schumann - play two movements
Rumba - Whitney
Slavonic Fantasy - Heumann
Sicilienne and Allegro - Bach/Teal (Solos for the Alto Sax Player)
Sonata - Eccles (play mvts 1, 2 & 4)
Adagio and Allegro - Handel/Gee
Sonata No. III - Handel/Rascher (play three mvts)
Sonata No. XIII - Handel/Rascher (play two mvts)
Sonata - Heiden (play one mvt)
Sonata No. 5 - Platti/Hervig (play all)

Class 2 Alto Sax Solos
Honor and Arms - Handel
Air and Dance - Corelli
Aria - Bozza
Arioso - Bach/Kent
Oxen Minuet - Haydn/Rascher
Sonata - Loeillet
Belwin Master Solos Intermediate:
*Honor and Arms
*The Cuckoo
*Fanfare and March
Master Solos Intermediate Level:
*Adagio and Giga
*Adagio and Allegro
*Allegro Scherzoso

Class 3 Alto Sax Solos
Fantango - Buchtel
Minuet - Bach/Rascher
The Cabalero - Burgstahler
Baroque Suite - Handel/Merriman (play two mvts)
Cantilena - Handel/Buchtel
La Villageoise - Rameau/Scarmolin
Hunters Chorus from Freischutz - von Weber/Rascher
Allegro from Concerto Grosso Op. 3, No. 4 - Handel/Dishinger

Class 1 Tenor Sax Solos
Two Bourrees - Bach/Teal (Solos for the Tenor Sax Player)
Pastorale and Bourree - German/Voxman
Adagio and Allegro - Handel/Gee
Sonata No. 5 - Handel/Ephross (play all)
Adagio and Allegro - Loeillet/Voxman
Gigue - Aubert

Class 2 Tenor Sax Solos
Canon in D - Pachelbel/Ramsay
Arioso from Cantata No. 156 - Bach/Kent
Bourree from Third Cello Suite - Bach/Dishinger
Gavotte and Bourree - Bach/Rascher
Romance and Troika - Prokofiev/Hummell
Adagio and Giga - Loeillet/Merriman

Class 3 Tenor Sax Solos
Novelette - Buchtel
March of a Marionette - Gounod/Walters
Allegro from Concerto Grosso Op. 3, No. 4 - Handel/Dishinger
Gavotte and Hornpipe - Purcell/Dishinger
Rigaudon from Pieces de Clavecin 1724 - Rameau/Dishinger
Rondo from Divertimento No. 11 - Mozart/Dishinger

Class 1 Bari Sax Solos
Sonata - Eccles (play mvts 1, 2 and 4)
Variations on a Theme of Robert Schumann - Davis
Suite - Corelli/Dishinger
Recitative and Rondo - Koepke
Undercurrent - Long
Andante and Allegro - Marcelo/Voxman
Three Pieces from Album for the Young - Schumann/Davis (Play all)

Class 2 Bari Sax Solos
Variations on a Theme of Robert Schumann - Ostransky
Sarabande and Gigue - Corelli/Voxman
Russian Sailor's Dance - Gliere/Hurrell
Contest Etude No. 1 - Ostransky
La Villageoise - Rameau/Scarmolin
Three Pieces from Album for the Young - Schumann/Davis (Play mvts 1 & 2 or 2 & 3)

Class 3 Bari Sax Solos
Menuet in G - Bach/Dishinger
Musette - Bach/Dishinger
Gavotte form Symphony No. 4 - Boyce/Vedeski
Allegro from Concerto Grosso Op. 3, No. 4 - Handel/Dishinger
Gavotte in Rondeau - Lully/Post
Forty Fathoms - Walters
Gavotte and Hornpipe - Purcell/Dishinger
Walzer - Grieg/Rascher
Class 1 Trumpet Solos
All'Antica - Goyens
Andante et Allegro - Ropartz
Badinage - Bozza
Ode for Trumpet - Reed
Concerto - Haydn - 1st movement is playable, long, but playable
Aria con Variazioni - Handel/Fitzgerald
Concert Etude - Goedicke
Suite - Gibbons/Cruft (play three mvts)
Trumpet Concerto in Eb - Hummell/Ghitalia (play mvt 1 or 3)
Concerto in Eb - Neruda (play mvts 1 & 2 or 2 & 3)

Class 2 Trumpet Solos
Honor and Arms - Handel
A Trumpeter's Lullaby - Anderson
Petite Piece Concertante - Balay
Tarantelle - Barrow
Suite - Corelli/Dishinger
Allegro from Trio No. 18 - Druchetzky/Dishinger
Italian Suite - Fitzgerald (play mvt 1, 3 or 4)
Conversation for Cornet - Grundman
Cantilena - Handel/Buchtel
Mozart Sonatina - Mozart/Ernst
Purcell Suite - Purcell/Fitzgerald (play Intrada and March, or Rondo)
Bouree in the Style of Handel - Smith
Contempora Suite - Young
Adagio and Allegro Marziale - Handel/Fitzgerald

Class 3 Trumpet Solos
Musette from Anna Magdalelna Notebook - Bach/Dishinger
Medici Masterworks Vol. 1 (Play any one)
Romance Melody - Glinka/Schuman
Allegro from Concerto Grosso Op. 3 No. 4 - Handel/Dishinger
The Valiant - Pelz
Gavotte in Rondeau - Lully/Post
Trumpet Stars (2 volumes, play any 1)

Class 1 Horn Solos
En Irlande - Bozza
Rondo in Bb - Cooke
Reveries Op. 24 - Glazounow (Solos for the Horn Player)
Pavane pour une Infante de'funte - Ravel (Solos for the Horn Player)
Nocturno Op. 7 - Struss/Franz
Concerto No. 1 in D (transposed to Eb) - Mozart/Sansone (play 2 mvts)
Concerto No. 3 - Mozart (play first or last mvt)

Class 2 Horn Solos
Solo Sounds for French Horn Levels 3-5, vol. 1:
*Andromeda
*Hornpipers Dance
*Allelulia from Exultate, Jubilate
*Melodies from Der Freischutz
Honor and Arms - Handel/Kaisershot
Gavotte from Symphony No. 4 - Boyce/Vedeski
Suite - Corelli/Dishinger
Allegro from Concerto Grosso Op. 3, No. 4 - Handel/Dishinger
Hornpipe - Handel/Ployhar

Class 3 Horn Solos
Musette from Anna Magdalena Bach Notebook - Bach/Dishinger
The Hunt - Ployhar
Gavotte from Harpsichord Suite No. 5 - Purcell/Vedeski
Rigaudon from Pieces de Clavecin 1724 - Rameau/Dishinger
Medici Masterworks Vol. 1 (play any one)

Class 1 Trombone Solos
Sonata in F - Telemann - Mvt 1 and 2 or 3 and 4
Ballade - Bozza
Sonata in F - Corelli
Andante et Allegro - Barat
Sonata No. 1 - Galliard
Sonata No. 6 - Galliard
Concert Rondo - Mozart/Ernst
Morceau Symphonique - Guilmant
Sonatina - Jones
Concertino - Ostransky

Class 2 Trombone Solos
Honor and Arms - Handel
Arioso and Caprice - Barnes
Turquoise - Vandercook
Garnet - Vandercook
Diamond - Vandercook
Mozart Sonatina - Mozart/Ernst
Prelude and Minuet - Corelli/Powell
Gavotte from Symphony No. 4 - Boyce/Vedeski
March of a Marionette - Gounod/Walters
Lyric Suite - Grieg/Dishinger
Andante and March - Fox

Class 3 Trombone Solos
Mediatation - Bkaleinikoff (will also work for Euph)
Ruby - Vandercook
Emerald - Vandercook
Medici Masterworks Vol. 1 (play any one)
Menuet in G - Bach/Dishinger
Saraband - Handel/Barr
King's Jester - Harris
Gavotte in Rondeau - Lully/Post
Rigaudon - Rameau/Dishinger

Class 1 Bass Trombone Solos
Trigger Treat - Hoffman
The Big Horn - Hoffman
Concertino Basso - Lieb\
Sonata No. 1 - Galliard
Sonata No. 6 - Galliard
Concerto in One Movement - Lebedev/Ostrander
Suite for Tuba - Haddad (play all)

Class 2 Bass Trombone Solos
Dramatique - Solomon
Ride of the Valkyries - Wagner/Uber
Way Down Blues - Armitage
Suite for Tuba - Haddad (play mvt 1 or 3)

Class 1 Euph Solos
Beautiful Colorado - Tough, but good
Sonata in F - Telemann - Mvt 1 and 2 or 3 and 4
Introduction and Dance - Barat
Andante et Allegro - Barat
Andante and Allegro - Ropartz
Sonata No. 1 - Galliard
Sonata No. 6 - Galliard
Suite for Baritone - Haddad (play mvts 1 & 2 or 2 & 3)
Largo and Allegro - Marcello/Merriman
Five Pieces in Folk Style - Schumann/Davis (play mvts 1 & 2)

Class 2 Euph Solos
Honor and Arms - Handel
Sweet Betsy Suite - Haack
Variations on a Theme by Robert Schumann - This used to be a class 1, but it's a VERY hard class 2 now.
Mozart Sonatina - Mozart/Ernst
Arioso and Caprice - Barnes
Polovetsian Dances - Borodin/Conley
Prelude and Minuet - Corelli/Powell
Suite - Corelli/Dishinger
Allegro from Concerto Grosso Op. 3 No. 4 - Handel/Dishinger
Elena Polka - Kiefer
Gavotte and Hornpipe - Purcell/Dishinger

Class 3 Euphonium Solos
Menuet in G - Bach/Dishinger
Air from Comus - Arne/Little
Country Dance - Haydn/Stouffer
Gavotte in Rondeau - Lully/Post
Rigaudon - Rameau/Dishinger
Jupiter - Buchtel

Class 1 Tuba Solos
Concertpiece - Painpare'
Concertpiece No. 1 - Vaughn
Lento - Holmes
Suite for Tuba - Haddad (play all)
Concertino for Tuba and Band - Bencriscutto
Variations for Tuba and Piano - Frackenpohl (difficult but fun)
Ricercar - Gabrielli/Morris
Tuba Rhapsody - Grundman
Sonata No. 1 - Marcello/Little
Introduction and Dance - Barat

Class 2 Tuba Solos
Honor and Arms - Handel
Larghetto and Allegro - Handel/Little
The Nervous Turkey Rag - Barnes
Gavotte from Symphony No. 4 - Boyce/Vedeski
Heart Victorious - Carissimi
Largo and Presto - Marcello
Colossus - Vandercook
Tarantelle - Walters

Class 3 Tuba Solos
Air from Comus - Arne/Little
Menuet in G - Bach/Dishinger
Musette - Bach/Dishinger
Haydn Medley - arr. Bell
In the Hall of the Mountain King - Grieg/Holmes
Allegro from Concerto Grosso Op. 3, No. 4 - Handel/Dishinger
Gavotte in Rondeau - Lully/Post
Gavotte and Hornpipe - Purcell/Dishinger