To get music in Geometry Wars simply do the following:

1: Get into Geometry Wars. (Go into the garage, walk up to the arcade machine and press the ''A'' button)

2: Press the ''B'' button once.

3: Now here comes the tricky part as it requires a little timing. Press the ''A'' button again so you are back into the garage. Now, wait about half a second then get back into Geometry Wars.

The music from the stereo should now be playing in the background.