Entry #8 (Unreleased Games) Batman: Revenge Of The Joker "Gotham In Danger"

Batman: Revenge of The Joker was set to be published by Sunsoft in 1992. The game was already released on the Genesis and NES under the name Return of The Joker. I include this game in good conscience because from what I've heard the soundtracks are different and are on different hardware under a different name. The NES soundtrack has some hits, too. 

Developer: Sunsoft

Composer: Naoki Kodaka

For more info read SNES Central's article

Entry #7 (Unreleased Games) Star Fox 2 "Meteor Overworld"

 

The wheels of improving technology crushed Star Fox 2. Faced with the imminent (but not really imminent) release of the Nintendo 64, Nintendo made an executive decision to never published the near-finished game. Apparently, Miyamoto decided that there should be a clear-break between the faux-3D of the Super Nintendo, and the polygonal N64.
Developer: Nintendo/ Argonaut Games
Composer(s): Either Kozue Ishikawa or Yumiko Kanki
If you want to play the game, there is a fan translation available.
For more info on the history of Star Fox 2 check out SNES Central's awesome article