Hi, just my thoughts on this subject. I think song lyrics are a kind of art forms of the language. They are like poems, and probably they will not help you acquire the language. You can "study" them, but it doesn't mean you will learn anything from them. They are things that give you the enjoyment of understanding the language, but not the things which help you learn the language. Even for native speakers, the meaning of many many songs are very vague, or even non-sense. Nobody understands what the author was trying to say or convey. If you try to acquire the language by studying the lyric of any song, I don't think it is a good strategy. It may works, to a certain extent, but it should be very limited.

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