Every audio CD has a list of tracks with their respective start times, so you can jump to specific songs. The first song also specifies a start time, which does not have to be zero. If it isn’t, the player will skip some of the audio, but you can still reverse back into it.
It’s funny how a CD is more like a tape with contiguous content and an index, rather than a file system.
https://en.wikipedia.org/wiki/List_of_albums_with_tracks_hid...