The Classic Standard - Duets for tenor & bass trombone (Neuheit Posaune) Over 50 pages of duets for tenor and bass trombone, written by Ilja Reijngoud, published by Ilja and Martin Schippers. The duets are all based on the harmonies of some well known classical themes. Ilja took the chord-progressions and composed new melodies over it. For each duet Ilja selected a particular Jazz rhythm, allowing classical and jazz players to familiarize themselves with all kinds of jazz timing and styles. The Classic Standard is meant to encourage classical and jazz players to play together and explore both classical performance and Jazz phrasing.