A good way to check which songs are compatable with LEGO is to go to the Music tab at the top of the page and view all the songs. Songs that are able to be played in LEGO appear with a green "FF" for family friendly. Songs that aren't able to be played apear as a yellow "SR" for supervision recommended.
Hope this answers any questions about what songs can be played in Lego, now go rock out!
Thank you =/ I just checked the offspring and the only song I can play on legos is the song I haven't downloaded yet >_<