It sounds like you're looking for the (formally "Arban's Complete Conservatory Method for Trumpet" ) adapted for trombone and baritone (euphonium/baritone horn, usually in bass clef).
Would you like a direct link to the or the free public domain scan ? arban method for trombone and baritone pdf
It sounds like you're looking for the (formally "Arban's Complete Conservatory Method for Trumpet" ) adapted for trombone and baritone (euphonium/baritone horn, usually in bass clef).
Would you like a direct link to the or the free public domain scan ?