iOS Question on streaming media (explicit songs)

I've been looking but can't find a solid answer. I see this:

3.3.12 Applications must not contain any obscene, pornographic, offensive or
defamatory content or materials of any kind (text, graphics, images, photographs, etc.), or
other content or materials that in Apple’s reasonable judgment may be found objectionable by
iPhone or iPod touch users.

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So I'm working on an app that will stream music. Some music may contain language that wouldn't get aired on terrestrial radio. The app doesn't "contain" the music, but streams it. It appears to be a fuzzy line to me. Granted, during the review process maybe all clean songs will be played and it gets through. But I don't want some sort of lawsuit or anything if Little Johnny downloads the app and freaks out for hearing a bad word on a song.

Do Pandora and Last.FM play only censored songs? Would just displaying a notice/warning be good enough?