Video
Game
Music

Several of these tracks don't seem to be used in the main game, but are still found/used elsewhere. Allusive 1, 2, and 4 as well as this version of Sentimental Dreamer are in Dr. Glenn's Other Dreams (an additional soundtrack for the game containing alternate recordings of some of the game's tracks). [S]Allusive 3 seems to be the one included in the game's official soundtrack and Allusive (with no number) is the one used in-game.[/S] Both versions of Not The Usual, as well as Smooth and Sentimental and the jazz version of Extraordinary seem to be tracks in the game's level editor (I don't have the Steam version of the game, so this is just based on what little I could find online).

EDIT: After playing the game again and reviewing a video of an earlier playthrough, it seems like this version of Allusive (no number) was used in a previous build of the game, while Allusive 3 is the one used in-game now. Not The Usual (Saxophone) and Smooth and Sentimental (as well as the LoFi version of I Wonder) appear as additional tracks in Clone's radio. Track #6 on Clone's radio I couldn't identify, and Panic I couldn't find in-game anywhere (likely another track from the level editor).