30 Songs for Tenor Trombone (kombinierbar mit der Ausgabe für Bassposaune) Through "30 SONGS" Martin Schippers and Steven Verhelst highlight some important aspects of playing the trombone. Every trombonist is challenged technically as well as musically in this book. You can play these songs by yourself of you can use this book in combination with "30 SONGS" for Bass Trombone.