Mixtape is the traditional term. Today we call them playlists because there’s no more tape. Mix CD just never felt right.
But whether mixtape or playlist, the idea is the same. You’re choosing songs from one context, placing them in another, and arranging them carefully to create an intended effect.
If you do your job right, not only will individual songs speak to the listener, but the entire playlist as a whole. It will create a single cohesive idea, a story that begins in one place then takes you to another–each song creating a bridge to the next.