i don't think so

Actually , I learned English Mostly by listening to music ... so simply i think it can :) ... in any language of course :)

Yes, I think listening to music helps you to catch some words or whole phrases. But it doesn't help with grammar, and sometimes songs are full of slang and some giberrish which doesn't make sense at all (for me at least). Like Nicki Minaj's songs :-)

Yes, it definitely can improve learning a language. I improved my English by listening to various kinds of music. It's not a 100% helper, but it helps a lot. It can help in learning new words, not grammar. Because grammar used in lyrics, is not completely correct.

@phn_uk: that's true also for iranian music, but still I think it helps you learning, because music transports feelings, which makes you remember words more easily.