I don't know if music in a new language works so well. Lots of songs have, like, "forced" slang or even changes in pronunciation or syllable stress to meet the constraints of the lyrics. In my country I see lots of people that only listen to music in English but don't have any grasp of it.

Instead, I would go with cartoons or children/preteen's shows first. In adult shows, even when not R-rated, characters usually speak way too fast, or, what is most common, the voices are not mixed very clearly, unlike cartoons.

What worked for me best (for English) was watching Disney movies, the same ones I watched in Spanish.

> She was great, 60 years old at the time and had us repeat the lyrics of Rammstein songs in class, her favorite band

This is hilarious, like "Now, kids, repeat after me, 'te quiero puta'"