Super Duets Trombones or Euphoniums Treble Clef is the 3rd volume of a progressive series of duet books that takes a young wind player from beginner to accomplished musician. Following on from the first 2 books in the series Starter Duets and Skilful Duets this collection contains longer pieces that are suitable for the more advanced player.Specifically tailored for each instrument, it takes the player into new keys, with new technical and musical challenges.