There is DLC for it.

" There is DLC for it. "

" Are they not good or something because ive never heard anything about it. "

Is it an Activision product?

There's 2 dlc's so far.
 
1st pack includes: gorillaz vs public enemy : dare vs can't trust this/ 50 cent ft mary j blidge vs queen:  all of me vs radio gaga
2nd pack includes: akon: sexy chick/ kelly rolland: when love takes over/ Will. I . Am:   On The Dance Floo
 
 The first dlc i liked alot it was really good, the gorillaz vs public enemy track was win biscuits and so was the 50 cent one with queen.
 
2nd pack was nice cause of sexy chick the will i am song i didn't like to much, when love takes over was okay though.
 
when playstation interviewed the dj hero producers, they said there will be more dlc with techno/drum n base/trance music in the future so there will be much more in the new year hopefully.

There's about 6 songs so far on DLC, considering the game's been out for about 2 months. The thing is that they have to license two songs, then get a DJ to mix the two songs, then chart down all the scratches and presses that the DJ does. It's a bit harder than Guitar Hero, where it's just one song, and they go straight to the charting. Then again, Guitar Hero also has 4 parts they need to chart. 
 
@End_Boss: DJ Hero is not made by the same guys as Guitar Hero, but Activision publishes them both. Activision also got rights from Neversoft to put the guitar parts into DJ Hero.