I still think it's so funny that Till The World Ends became a hit.
Kesha probably didn't want it because even for her, it's too generic

Oh, so let's pawn it off to Generia Succubus, Botany 2000

What's funnier is that the song became a hit! And then Katy Perry copied the melody for Part Of Me
Okay, maybe she wrote Part Of Me first. But she did re-release it, so eek!