Ok my fellow DJ's, I just picked up my copy of DJ Hero for the Xbox 360 from Best Buy and it came with the DJ Hero Unlock Code for Daft Punk. You get their songs and get to use them as DJ's as well.

Here it is:

1) Go to Options Menu

2) Choose: Cheats

3) Choose: Retail Cheat

4) Enter Code: d1g?

Here is another DJ Hero Unlcok code for you to unlock DJ Z-Trip. Follow the same system as above but instead Enter Code: 5RTG 

Let me know how it worked out, peace.