How do I make an audio file repeat?

In order to make an audio playback loop, click Transport > Loop Play. The playback should start automatically, and loop back to the beginning when it reaches the end. Interrupting or stopping the playback will stop the track from looping.

How do I listen to a song on loop?

If you loop a song, you play it on repeat. (You can also put it on repeat.) This doesn’t necessarily have the connotation that the original phrase seems to have of wearing out the song’s welcome. To clarify, you can use an adverb like endlessly.