Michel Cals (b. 1951) composed his Quatre Inventions for Percussion and Piano to be played in a competition at Paris Conservatoire. As an unusual contemporary addition to the Percussion repertoire this Cals piece is a must-play for percussionists wishing to broaden their style. The four pieces bear the name of their instrumentation; 1. Accessories and Vibraphone 2. Xylo-Marimba 3. Snare Drum and Drum Kit and 4. Five Timpani. Exploiting Percussion to its full potential Cals' Quatre Inventions is essential to the repertoire of advanced percussionists.