Street Dance is a Dance Dance Revolution clone that was included in a compilation bundled into a number of dance mat famiclones from various companies. It gained notoriety due to being what it is and its sampled music (seemingly impossible on the NES, though it actually being on a plug & play device and using special hardware explains that) and having Jar Jar Binks of all characters (but if you see the prototype, it makes more sense).
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Unused Sound Effect#
This selection sound, lifted straight from the Dance Dance Revolution games, can be found at $1FB490.
(Source: codyryan)
Unused Graphics#
At $E010 are graphics for seemingly CRT screens, showing an Asian man and... Michael Jackson? This appears to be one of the backgrounds that would have appeared in-game, judging from being next to other backgrounds.
There are also these tiny arrows at $F010 styled after the Dance Dance Revolution ones.