I had 15 kids my first year at a 1A and they were weak. The year before I heard you couldn't even recognize the school song or fight song.

I wrote out simple short stand tunes in Musescore. Go Fight Win, Eat Em Up, Land of 1000 Dances, Hey Song, Darth Vader, Sail, 7 Nation Army.. Etc. Super comfortable range and simplified rhythms.

Low Brass/Low Reeds/Tuba Unison Line
Trumpet/Flute/Clarinet Unison Line
Alto/Horn Harmony Line
Simple Percussion Beat