Mythical lyre player (7)
I believe the answer is:
orpheus
(Other definitions for orpheus that I've seen before include "Underworld figure" , "Legendary Greek poet, who lost Eurydice tragically" , "Legendary musician" , "In Greek myth he followed his wife Eurydice into the underworld" , "In Greek myth, poet who followed Eurydice into the Underworld" .)