1. 'Call Me Maybe'
The Justin Bieber-approved pop ditty is truly a summer phenomenon and it's finally reached the top. Prepare for this summer anthem to never, ever leave your head (or your radio).Justin Bieber Gives Singer Carly Rae Jepsen a Boost »
4. 'Wide Awake'
Katy Perry is a busy kitty – aside from promoting her 3D concert movie, she's also dropped a new single, 'Wide Awake.' It rises five spots this week to Number Four.Katy Perry Developing 3D Concert Movie »
Buoyed by his recent 'Saturday Night Live' musical performance and hilarious cameo in a Digital Short, Usher holds steady on the charts this week – he climbs three spots with his first single from his album 'Looking 4 Myself,' which enters Billboard at the top this week.Video: Usher Performs 'Scream' on SNL »
28. 'The Fighter'
Gym Class Heroes are finding all the right collaborators this year – first Adam Levine, now Ryan Tedder. 'The Fighter' continues to ascend the charts this week, landing at Number 28.Video: Gym Class Heroes Play Acoustic 'Fighter' »
The English singer-songwriter and Brit Award-winner is poised to have a fruitful career in America, too; his sensitive debut enters the charts at Number Five.Blur, Adele Win Big at BRIT Awards »
The Canadian-American electro-rockers boast a cameo from Lou Reed on their fifth studio album. They crack the charts at Number 12.Album Review »
14. 'That's Why God Made the Radio'
The Beach Boys' new album – timed to coordinate with their national tour and 50th anniversary – is, unfathomably, their first album to debut in the Top 10. The pop legends sold 61,000 copies of the record in the first week to crack the charts at Number Three; this week, they slip 11 spots.On the Charts: The Beach Boys' Best Debut Ever »
23. '...Little Broken Hearts'
The jazzy pop singer-songwriter took a bold detour from her contemporary catalogue when she paired with Brian 'Danger Mouse' Burton. After several weeks in the Top 20, then one below it, she nudges back up to Number 23.Norah Jones, Danger Mouse Craft Moody, 'Weird' EP »
1. Lana Del Rey
Everyone has stopped talking about Lana Del Rey's faltering music career and moved on to her rumored romance with Axl Rose. Welcome to the tabloid jungle, honey.Report: Axl Rose Is Dating Lana Del Rey »
7. The Black Keys
The blues-rock duo hit a new career high this spring when they headlined two sold-out shows at Madison Square Garden. The killer set proved indisputably that the band can conquer any stage.The Black Keys Storm Madison Square Garden »
23. Foo Fighters
Who is having more fun than Dave Grohl? No one, that's who. This spring, the Foo Fighters frontman made his 11th appearance on 'Saturday Night Live,' making him the most frequent musical guest in the show's history. He's also acted in a few memorable sketches, including the fan-favorite Crisis of Conformity hardcore bit.Dave Grohl Makes His 11th Appearance on 'Saturday Night Live' Tonight »
The British rockers have announced that they will release their next album, 'The 2nd Law,' in September. That give them plenty of time to catch the Olympics, for which they recently participated in the famous torch relay.Muse to Release '2nd Law' Album in September »