"Track" came from serial media like LPs, 8-Tracks or the soundtrack of a motion picture film, or a Compact Disc. But an MP3 "file" in a player doesn't exist on a revolving disc (disk) or tape. What is a more universal term for a segment of music stored in an electronic format?
Bonus points if it can apply to something besides music, like a part of an audio book. Or to things not audio in nature... Because there are lots of kinds of "tracks" that can be taken from a CD and stored in other ways.