According to the SE store...

Standard Edition (CD): 80x songs

Standard Edition (BR): mp3 files, graphics.

Limited Edition: Florence + the Machine song (how Stand By Me isn't included in the standard edition I don't even know), behind the scenes recording session "among others", bonus BR disc with the entire car stereo, featuring over 250 songs from the series (apparently the largest ever compilation from SE), bonus CD with piano arrangements of several tracks from the game, and a large sized booklet with discussion from the music team.

Also, definitely agree that some tracks were interrupted too easily by fight music. I'd have loved for the FFXV songs you've stumbled across in the game's story to be added to the car stereo/mp3 player as you go, or at least in the endgame put the whole lot in.