Thought people might want some cheats for DJ Hero, so here you go.
-Cheat mode
At the main menu, choose the "Options" selection, and select the "Cheats" option. Then, enter one of the following codes at the indicated "Cheat" menu to activate the corresponding cheat function:
All characters, mixes, and stages
At the "Unlock Everything" menu, enter "tol0" as a code. Note: This code cannot be used online and will disable high scores.
Hyperdeck mode
At the "Retail Codes" menu, enter "76ST" as a code. Note: Enabling this code will prevent the game from being saved and progress on the leaderboards.
Daft Punk and mixes
At the "Retail Codes" menu, enter "D1G?" as a code to unlock Daft Punk and their mixes.
DJ AM
At the "Retail Codes" menu, enter "k07u" as a code to unlock DJ AM.
DJ Jazzy Jeff
At the "Retail Codes" menu, enter "n1fz" as a code to unlock DJ Jazzy Jeff.
DJ Shadow
At the "Retail Codes" menu, enter "oMxV" as a code to unlock DJ Shadow.
DJ Z-Trip and mixes
At the "Retail Codes" menu, enter "5rtg" as a code to unlock DJ Z-Trip and his mixes.
Grandmaster Flash
At the "Retail Codes" menu, enter "Ami8" as a code to unlock Grandmaster Flash.**
Credit goes to http://www.cheatcc.com