Protocol: A Guide to the Collegiate Audition Process for Trombone (We’ve added two new volumes to the Protocol: A Guide to the Collegiate Audition Process series, for Alto Saxophone and for Trombone. Providing useful reference and audition material for college-bound saxophone and trombone players, these books were created by college/university music educators and include the most frequently requested audition requirements from many universities. Students will go into their auditions completely prepared with help from these books!)