Trombone Duet Trombone - Level 3 - Digital Download SKU: A0.749116 Composed by John Klenner and Sam M. Lewis. Arranged by Andy Derrick. Contemporary. Score. 6 pages. Andy Derrick #4801778. Published by Andy Derrick (A0.749116). This is an original arrangement of this classic standard Just Friends for two trombones and rhythm section. With an intro, head in harmony, open solo section and head out, this is a properly structured ready-to-go arrangement. Parts for two trombones, piano, bass and drums are included.