Hot Video Alert: Neon Trees Cover Justin Bieber's 'Baby'

The new Billboard.com column Mashup Mondays is probably one of the most exciting online music experiences since Radio 1's Live Lounge. This weeks "Mashup" features Utah rock quartet Neon Trees covering Justin Bieber's Top 5 hit single "Baby." The band kicks it up a notch, throwing in a doo-wop twist and a little "Stand By Me" for good measure. Whether you LOVE or DESPISE Justin Bieber, you'd