Marsyas, the unhappy rival of Apollo, was said to be a native of Celænæ in Phrygia.  Olympus was a pupil of Marsyas (Schol. in Aristoph. Eq. 9).  By Plutarch (Mus. xi.) he is called ἀρχηγὸς τῆς ῾Ελληνικῆς καὶ καλῆς μουσικῆς.  cf. Arist., Pol. VIII. v. 16.