Hello! Can you recommend me any good French, Italian, German and Spanish music?
I'm more into rock (indie or 70s, 80s, 90s) but I like music experiments, jazz, hip-hop is not always bad, it could be alternative music but not pop. I'm looking for good bands and singers who sing in their native language.

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I will suggest some of my favorites in each of the languages. I hope you enjoy.
French: https://www.youtube.com/watch?v=fztkUuunI7g
Italian (actually Neapolitan): https://www.youtube.com/watch?v=NUVgjjSsbOM
German: https://www.youtube.com/watch?v=3mgnz3dxDdc
Spanish: https://www.youtube.com/watch?v=NDLCmPYTMhU

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tanto pe cantà- nino manfredi. My favorite song!

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German - of course Rammstein, Eisbrecher, Faun (it's folk band). 
French - I like fast all songs from the musical "notre dame de paris"