The volumes in this new series contain duos, trios and quartets, their degree of difficulty ranging from easy through intermediate to advanced. Every piece is a transcription or an arrangement, since in editing the volumes our primary concern was to provide a collection of valuable and interesting compositions, as freely variable as possible as regards instrumentation, for music school students and also for adults who make music for their own pleasure. The range and pitch of the parts enable the works to be performed on any required or possible combination of the given instruments.

The Easy trios volume in the Ad libitum series offers a rich variety of simple three-part settings for beginners on their instruments. This volume contains not only the simplest of folk song arrangements and transcriptions of Renaissance and early Baroque vocal pieces but also easily performable excerpts from works by great composers such as J. S. Bach, G. F. Händel and J. Haydn. Here you can find well-known favourites too (Mozart's Terzetto from The Magic Flute; Beethoven's Ode to Joy). One special item is a little-known version of a popular children's song arranged by Mozart too ('Ah, vous dirai-je, maman'), in an arrangement by one of Bach's sons, J. Ch. Fr. Bach.