I just came across a wonderful retro band called Postmodern Jukebox. They cover todays hits and arrange them as if they were written half a century ago. So Macklemore's Thrift Shop sounds like it is a 20s flapper song and Call Me Maybe is suddenly ragtime. They also made an entire album with just Nickelback covers sounding like Motown.
Edit 11-04-2014: Op 20 juni spelen Scott Bradley & Postmodern Jukebox in de Melkweg in Amsterdam!