I learned German while I was into NDH metal. Its the only language I learned well at all. But I stopped studying the language after I found out that I knew and understood German words that I didn't know the English translation to (I was afraid I was forgetting English). Then I lost interest in NDH some time after that and never picked it up again. I still understand it, though I struggle to form sentences of my own now.
I've thought about picking up language again, but I'm not so sure about using foreign music as a motivator for learning a language anymore. For one, it can give you a false impression of the language. Also, it doesn't involve you actually producing sentences of your own. I've tried to look for places where I could talk in various target languages I want, but none of them seem to be too active (it seems like nobody uses forums anymore).
I'm struggling to find a way to immerse myself in a language. I just can't seem to find any. I can't find anyway to actually use any language I learn, and the only things I can think of where I'll get any exposure to a language is music, and perhaps reading foreign news.