I FORGOT THIS APP NAME D=?

[Jordan]

Ok, I used to have a fun app. Let me describe it a little, I hope someone can remind me of the apps name:
It loads up with a list of your music, and you select one song. Then it loads the song, the song is playing and at the same time there is a long 3D trail that you ride along, and the trail goes along with the beat.
(Such as in a dubstep the trail would be going straight and a little bumpy at the build up, then "When the bass is dropped" it would go crazy up and down.)
Edit: I think it had "Synth" somewhere in the app name.

[Ali]

Mybe Grooveshark or download MP3

[Talia]

audiosurf?