The youthful R&B sensation Mario was signed to J Records when he was only 15, and hit the ground running with a high-charting debut album in 2002 featuring a popular remake of Biz Markie's "Just a Friend." His 2004 follow-up spawned a number one single co-written by Ne-Yo, "Let Me Love You." By the time he released his fourth, star-studded album in 2007, his vocals, writing, and performance had all matured significantly, making him one of contemporary R&B 's heaviest hitters.