Philammon was a figure in Greek mythology, a celebrated singer and lyre-player, most often called a son of Apollo. By Chione, daughter of Daedalion, he was the twin half-brother of Autolycus and thus stood in the same extended family as Odysseus. He was said to have founded the mysteries of the Lernaeans and to have been the father of the bard Thamyris, whom the Muses blinded for challenging them.
Adapted from Wikipedia, "Philammon" · CC BY-SA 4.0
I.The singer
Ovid and Hyginus tell how Apollo lay with Chione on the same night as Hermes and begat Philammon, famed for song and lyre, while Hermes begat Autolycus the thief.
Hyginus also records an alternate tradition in which Apollo's mother was Leuconoe, daughter of Lucifer, not Chione.
II.Legacy
Pausanias credits Philammon with establishing the mysteries of the Lernaeans near Argos.
Apollodorus makes him father of Thamyris, the Thracian minstrel whom the Muses defeated and blinded when he boasted he could outsing them.