Not much music is available in the prototype, and even then, several completed tunes can only be heard in the sound test, and are not used in any of the rounds. All of the music in this prototype sounds different to the final version of the game, with some tracks -such as Hassou!!! and He Runs -going on for longer.

In the sound test, music track 6 cannot be played. However, DarkJoaki managed to make it work. It is possible this tune was meant for the intro sequence, since it synchs up pretty well with it -as this video from VidGmr1996 proves.

Track title:
Used in:
???
Unused
Boss!Boss!
Any boss stage
Hassou!!!
Unused
He Runs
Stages 1-1, 1-2, 4-1, 4-2, 4-3, 5-1, 5-2, 6-1, 7-1, 7-2, 7-3, 8-1 & 8-2
Inner Darkside
Stages 3-1 & 3-2, Bonus game
Ju Goya
Stages 7-4, 7-5 & 7-6
Map Da!
Round start screen
Ninja Luluby
Unused
Ninja Soul
Stages 1-3, 1-4, 2-2, 2-3, 2-4, 3-4, 4-4, 5-3, 5-4, 6-2, 8-3 & 8-4
Round Clear
Round clear screen
Rush © Beat Me
Unused
Sakura
Unused
Shinobi Walk
Stage 2-1
The End
Ending sequence
Yayoi
Unused