More than 60 instrumental compositions scattered in various musical libraries are attributed to Giovan Battista Pergolesi, but we know today that only a small part of them can be considered authentic without a doubt. The others, except for a few for whom the real composer has been found (Count Wilhelm Unico van?Wassenaer for the famous “Concerti armonici”, Graun, Alberti and Gallo) are all anonymous. These recordings, based on Marvin E. Paymer’s authoritative catalogue of Pergolesi’s works, include all of Pergolesi’s instrumental compositions, both those known to be authentic and works which are “probably” his.