'The French word "Passe-Partout" means "Master Key". As the title implies, this music serves as a key which unlocks the door to the possibility of an unlimited variety of instrumental combinations. The music in this book is readily playable by any, or all, of the instruments which are depicted inside the ring of the key on the front cover. The list of instruments at the side of the key states which instruments can play along using the other books from this set together with this one. When played with piano, the music is suitable as either trio or quartet. All the books in this series with the same colour design can be used together, thus giving the music a unique and unlimited flexibility. The music is light and entertaining and is ideally suited as lesson material. These works are also suitable as resource material for GCSE ensemble work in Great Britain. Above all it is music simply to be enjoyed by both player and listener alike.' (taken from the back of the book)
Difficulty level, roughly compared to ABRSM exam grades. 0 is beginner, 9 is advanced (beyond grade 8).