No. The artists will only, AND ONLY, show up for their own songs, DLC or otherwise.
Unfortunately, there is no Bowie/Queen combo for Under Pressure, even though I think it passed the filter. Just Queen plays it.
"They're goin' ta have to bury what's left of ya in a soupcan!
I have a feeling that the list that I posted hasn't been updated in while. The newest approved DLC it shows is back when the Guess Who got DLC.
"You odd, stealy, evil person." - DrifterUK
I though that you would buy the characters in a store using studs, the same way you would buy characters in other Lego games.
 Faith No More
 Type O Negative
 More NIN
 More RHCP
 More DKs
 More SoaD
 More QotSA