I haven't studied either of those languages, but I do enjoy listening to music in the laguages I'm studying.
I think you can learn a lot, and the music can motivate you or get you more excited about learning.
You do have to be careful, though, because music usually uses many colloquialisms (slang), and the grammar can be significantly altered. Full sentences are often not used, and songwriters often take many liberties with word usage and grammar.
So I would say you need to supplement your learning with something more formal.