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Re: Rubank Book of Trombone/Baritone Solos
What written PML are you referencing? I was under the impression that they quit making a printed copy several years ago and have only been using an online version that gets updated yearly.
The class 3 trombone solos may also be played by baritone according to the rules on the PML. https://www.uiltexas.org/pml/BandSECodesPerfReq.htm