The DJ max series has been successful in Korea and even imported it's way to America. DJ Max Fever, made specifically for the US, is bringing back songs from DJM and DJM 2, also with some extra songs that weren't in either of the two.
You have buttons to press on your psp along with the song, making sound effects as you play. Don't let your life bar go down, or you lose. Press the X button when your fever gauge is full to get more points.