As my favourite bands and musician are from English speaking territories, I prefere English then. But for me the most beautiful language in music is Portuguese. Even though I understand so little.
Also, since I've studied Italian language I love to listen music on Italian.
Specially Jovanotti who is my favourite Italian musician even he doesn't sing so as he is reciting
This song
"Mi fido di te" has so beautiful energy, sound, lyrics. Love it.