Bach_m is right. You can't get done for downloading, but you can for uploading. Just because of the nature of it. There's no real line between what's punishable and what isn't, I'd say downloading 100 songs all at once was punishable, but downloading one a day probably isn't.
Edit: oh, I didn't answer.
People I know normally send me songs, and that's probably equally illegal, but you can't get done for it. Who
honestly has never downloaded a song in their life? Then think about how full the prisons would be... it's not gonna happen.
Edit 2: voting, because the percentages are horrible, out of 9 votes.