Week of March 13

Here are the highlights of a tight chart week:

Her first No. 1: Canadian soul singer Melanie Fiona earns the first charttopper of her career as "Gone and Never Coming Back" moves 3-1. She made her chart debut last year as a guest artist on John Legend's remake of "Wake Up Everybody." Fiona is the fourth artist in 2011 to earn that first No. 1, following Neon Trees, Ricky Martin and Joss Stone.

Trying for four in a row: Fiona is also a guest artist on the remix of Cee-Lo Green's "Fool for You" (which falls 5-10 this week in its original album version). Green has had a heck of a year, and he shows no signs of stopping as "Bright Lights Bigger City" is the week's biggest mover. It's up 33-26. Since last autumn, the soul singer has gone to No. 1 with "Fool for You," "Forget You" and his duet with Fantasia, "The Thrill Is Gone."

Other contenders: These artists show signs of having future Top 10 hits: pop-rockers Runner Runner, up 30-25 with "Hey Alli," country duo Thompson Square, moving 34-30 with "Are You Gonna Kiss Me or Not?" and the duo of Jennifer Lopez and Pitbull, with the week's only debut, "On the Floor," at No. 39. It's Pitbull's third guest appearance in six months, following concurrent hits with Enrique Iglesias and Usher. Lopez marks her first appearance in the Top 40 since "Do It Well" hit No. 28 in 2007.