I must provide a disclaimer - I'm into modern hard rock with a side of classical, jazz, bluegrass, and whatever. Not pop or hip hop or stuff that doesn't focus on instruments or vocals. It's just my personal preference - no insult intended to anyone who prefers other genres.
I've heard of Bruno Mars, of course. I saw a white guy pretending badly to be into hip hop. Yeah, he's sort of cute, and he almost managed to keep up with his backup dancers (who were all black - I guess to give Bruno his creds). So .. what's his appeal? I didn't see it.