*Imagine Dragons' Kendrick Lamar-assisted remix of "Radioactive" climbs from second to first this week, knocking YG's "Who Do You Love?" to fourth. T-Pain's "F**k 'Em," formerly third, becomes the runner-up.
*Up from our Rap Chart, Ludacris's "Party Girls," Big Sean's "1st Quarter [Freestyle]" and Yelawolf's "Box Chevy 5" land in sixth, eighth and 11th.
*Trey Songz's "Na Na" graduates from our R&B/Pop Chart to snag 20th.
*Katy Perry's "Dark Horse (Remix)" makes the jump from our Club Hip Hop Chart, claiming 13th.
*Kid Ink's Fired Up," French Montana's "All for You" and Juvenile's "Booty" narrowly miss appearing on the chart. Your feedback and ratings will determine whether they make the cut next week!