The discussion about the uses of the concept “musical object” highlights the difficulties of the project – put forward by Pierre Schaeffer (1966) – of basing its definition on the idea of “objet sonore”. Moreover, the proposal to assimilate the functions of the “objet sonore” to those fulfilled by a “musical work” turns out to be no less problematic. A new definition is proposed: a musical object is a social object resulting from the inscription of perceived sound(s), or of the acoustic event(s)/object(s), in a reference system recognized as “musical” by a group of (minimally) two people.