A music player was a portable electronic device used to play music. Its use required a battery.
Groodo the Hutt owned an antique music player called an Audiobulb. Its battery, as one of the Hutt's assassin Razor Eater droids found out, was highly combustible.
At least one of the Imperial guardsmen or one of the collection of prisoners held on the harsh planet of Despayre possessed a music player.