All Jazzed Up Trombone (Bass Clef)As well as providing material which is enjoyable to play, the student's musicality is developed by virtue of the fact that the pieces are genuine duos between the two instruments. The 'give and take' between trombone and piano necessitates careful listening and a sympathetic response from both performers. Robert Ramskill. The CD contains both a complete performance and play along backing track for each piece.