''Break Your Heart,'' ''Carry Out,'' ''Bulletproof,'' and more tunes making an impact on the Hot 100

By Leah Greenblatt
Updated April 02, 2010 at 04:00 AM EDT

Billboard calls it the Hot 100, and indeed, there are always several kinds of smoke to be found on the music industry’s official barometer of pop currency: slow burners, fast flameouts, even the odd little Roman candle blazing from obscurity. Below, we examine 10 of the most intriguing flare-ups on the April 3 chart.

The ”Break”-out Brit
Taio Cruz, ”Break Your Heart”
(No. 5) The second London-bred R&B import — after Jay Sean — to hit the top spot recently (he has since fallen a bit), Cruz scores with his cocky club-crusher about a man with no plans for monogamy. B

The Timbo Twofer
Timbaland feat. Justin Timberlake, ”Carry Out”
(No. 11) With a melody as stealthy as its chart ascent (four months and counting), this spare midtempo duet sounds like the sonic product of two dudes, a set of water glasses, and a spoon. Somehow, it works. B+

The Hip-Hop Leapfrogger
Drake, ”Over”
(No. 17) He’s still working on his full-length debut, but rap’s Canadian wunderkind already has a near-instant top 20 hit (his fifth, counting collaborations) with this loping, string-sampling ode to his own swift success. Meta! B

The Irish Surprise
The Script, ”Breakeven”
(No. 18) The melodic Irish rockers’ tuneful, shamelessly earnest paean to lost love continues to climb — surpassing their nearby chart neighbor, Idol champ Kris Allen’s cover of their own ”Live Like We’re Dying.” B+

The Long-Hauler
OneRepublic, ”All the Right Moves”
(No. 20) Initially, the Colorado quintet’s latest wasn’t much of a mover when it bowed last fall. But like their ’07 smash ”Apologize,” it mines a surprisingly sticky hook from dense pop-rock atmospherics. B+

The Superstar Sampler
Jay-Z feat. Mr. Hudson, ”Young Forever”
(No. 33) Rap titan + ’80s synth-schmaltzers Alphaville’s ”Forever Young” = guilty-pleasure gold. A

The Nashville Upstart
Easton Corbin, ”A Little More Country Than That”
(No. 42) He may hail from Florida, but Corbin swears he’s more country than ”a Hank song from days gone” on his debut single, a twangy hat-tip to the old school. B

The Double-Upper
Trey Songz, ”Neighbors Know My Name”
(No. 51) While his superior ”Say Aah” still stretches its legs in the top 20, the R&B loverboy’s brazenly hornball bedroom jam continues to rise. R. Kelly, see what thou hast wrought. C

The Teen Drama Queen
Miley Cyrus, ”When I Look at You”
(No. 58) Disney’s alpha girl aims for adult-contemporary gravitas on this pensive piano ballad from her upcoming big-screen tearjerker The Last Song. She falls a little short. C+

The Scenic-Router
La Roux, ”Bulletproof”
(No. 71) The coed U.K. duo’s good-riddance-to-bad-exes anthem, an addictive riff on Erasure-style ’80s pop-tronica, has finally begun to scale the Hot 100 — half a year after topping Billboard‘s Hot Dance Club Songs. A-