This trombone feature is just awesome! If you?re trombonist can?t improv, we have provided a suggested solo. If he can improvise, this will be the hit of any concert!!!!!!!! Grade 4 Along with the traditional brass instrumentation (Trumpet 1 and 2, Horn, Trombone and Tuba), there are substitution parts provided for: Alto Sax (for Trumpet 2) Alto Sax (for Horn) Trumpet 3 (for Horn) Trombone (for Horn) Baritone Treble Cleff/Tenor Sax (for Trombone) Baritone Sax (for Tuba) Horn (for Trombone)