Week Ending April 15, 2012. Songs: Gotye Beats Bieber

"Somebody That I Used To Know" by Gotye featuring Kimbra sold 542,000 copies last week, which constitutes the biggest one-week sales total in more than a year. It swipes the 2012 sales crown from Justin Bieber's "Boyfriend," which sold 521K copies in its first week two weeks ago. This helps the song jump from #2 to #1 on the Hot 100, displacing "We Are Young" by fun. featuring Janelle Monae.

This marks the first time that rock tracks have been back-to-back #1 hits on the Hot 100 since July 2000, when Matchbox Twenty's "Bent" followed Vertical Horizon's "Everything You Want."

TV exposure triggered the sales surge for "Somebody That I Used To Know." Gotye and Kimbra sang the song on Saturday Night Live on April 14. It was featured on Glee on April 10. The Glee version enters the Hot 100 at #26. Digital sales rank: #10 (152K).

You may recall that TV exposure was also instrumental in breaking "We Are Young," which exploded after it was featured in a commercial which aired during the Super Bowl. (Before that, the song had also been featured on Glee.)

Only three other songs in digital history have ever sold as many copies in one week as "Somebody That I Used To Know" does this week (and none was as deep into its run as Gotye's hit, which is in its 15th week of digital release.) Flo Rida's "Right Round" sold 636K in its first week in February 2009. Ke$ha's "TiK ToK" sold 610K copies in its 14th week in December 2009. Bruno Mars' "Grenade" sold 559K copies in its 13th week in December 2010.

"Somebody…" was #1 in the U.K. for five weeks in February and March. It's the second transatlantic #1 so far this year, following Katy Perry's "Part Of Me."

Gotye (real name: Wouter "Wally" De Backer) was born in Belgium and reared in Australia. Billboard's Gary Trust notes that Gotye is the first artist who was born in Belgium to reach #1 since the Singing Nun, who topped the chart for four weeks in December 1963 with "Dominique," a foreign-language hit that was an out-of-nowhere phenomenon. Kimbra (full name: Kimbra Johnson) is from New Zealand.

"We Are Young" sold 333K copies this week. This is the seventh time that its weekly sales have exceeded 300K. No other song in digital history has sold 300K more than five times.

"We Are Young" is still ahead of "Somebody That I Used To Know" in radio points. "We Are Young" is #1 on the Hot 100 Airplay chart for the second week, while its rival jumps from #12 to #8. The fun. song lost the Hot 100 crown because it slipped behind the Gotye song on both Hot Digital Songs and on the new On-Demand Songs chart.

Justin Bieber

touted Carly Rae Jepsen to his 19 million Twitter followers. That went a long way to helping her single "Call Me Maybe" become an international hit. It jumps from #10 to #8 in its eighth week on the Hot 100. In the U.K., it holds at #1 for the second straight week. But there's a slightly awkward little wrinkle: By holding at #1 in the U.K., it prevented Bieber's hit "Boyfriend" from debuting at #1 there. Instead, the song opens at #2. Even so, it's Bieber's biggest hit to date in the U.K., topping "Baby" (featuring Ludacris), which peaked at #3.

"Boyfriend" also debuted at #2 in the U.S. two weeks ago (behind "We Are Young"). It holds at #5 this week. Both "Boyfriend" and "Call Me Maybe" top the 1 million mark in U.S. digital sales this week.

Adele's

"Rolling In The Deep" this week becomes just the second song to top the 7 million mark in digital sales. It follows the Black Eyed Peas' "I Gotta Feeling," which topped the 7 million mark in March 2011. Adele's song shaved a full six months off the time it took the Peas' song to sell 7 million digital copies. "Deep" is in its 67th week of release. "I Gotta Feeling" took 93 weeks to hit 7 million. The Peas' smash has sold 7,890,000 copies.

LMFAO

really is laughing all the way to the bank. The party-minded duo this week becomes just the sixth (and certainly the most unlikely) act to top 5 million mark in digital sales with two or more songs. The duo's "Sexy And I Know It" has sold 5,041,000 copies. Its earlier "Party Rock Anthem" (featuring Lauren Bennett and GoonRock) has sold 6,629,000. The other acts who have amassed two or more 5-million sellers are Katy Perry (who leads all artists with four), Lady Gaga (who has had three) and the Black Eyed Peas, Flo Rida and Bruno Mars (with two each).

Here's the low-down on this week's top 10 songs.

1. Gotye featuring Kimbra, "Somebody That I Used To Know." The song jumps from #2 to #1 in its 15th week on the chart. This is its seventh week in the top 10. The song tops the 2 million mark in digital sales this week. Digital sales rank: #1 (542K).

2. fun. featuring Janelle Monae, "We Are Young." The former #1 song dips to #2 following six weeks on top. This is its 17th week on the chart; its 10th week in the top 10. Digital sales rank: #2 (333K).

3. The Wanted, "Glad You Came." The song holds at #3 for the fourth time the past five weeks. This is 14th week on the chart; its eighth week in the top 10. Digital sales rank: #8 (181K).

4. One Direction, "What Makes You Beautiful." The song holds at #4 for the second week in its ninth week on the chart. Digital sales rank: #3 (267K).

5. Justin Bieber, "Boyfriend." The song holds at #5 for the second week in its third week on the chart. The song tops the 1 million mark in digital sales this week. Digital sales rank: #4 (255K).

6. Flo Rida featuring Sia, "Wild Ones." The song jumps from #7 to #6 in its 15th week on the chart. This is its fifth week in the top 10. Digital sales rank: #7 (187K).

7. Nicki Minaj, "Starships." The song dips from #6 to #7 in its ninth week on the chart. It has been in the top 10 the entire time. Digital sales rank: #6 (204K).

8. Carly Rae Jepsen, "Call Me Maybe." The song jumps from #10 to #8 in its eighth week on the chart. This is its third week in the top 10. The song tops the 1 million mark in digital sales this week. Digital sales rank: #5 (227K).

9. Kelly Clarkson, "Stronger (What Doesn't Kill You)." The former #1 song dips from #8 to #9 in its 17th week on the chart. This is its 13th week in the top 10. Digital sales rank: #11 (120K).

10. Katy Perry, "Part Of Me." The former #1 song dips from #9 to #10 in its ninth week on the chart. It has been in the top 10 the entire time. Digital sales rank: #15 (114K).

Drake

has three bulleted hits on this week's chart. "Take Care" (featuring Rihanna) holds at #11 for the third straight week. It has climbed as high as #7…"The Motto" (featuring Lil Wayne) jumps from #16 to #14 in its 22nd week. This is its highest ranking to date…"HYFR (Hell Yeah F*****g Right)" (featuring Lil Wayne) jumps from #91 to #77 in its sixth week.

Calvin Harris' "Feel So Close" jumps from #13 to #12 in its 10th week…Train's "Drive By" jumps from #14 to #13 in its 14th week. This matches its highest ranking to date. The song tops the 1 million mark in digital sales this week…B.o.B's "So Good" jumps from #19 to #16 in its eighth week. The song has climbed as high as #11.

"Ass Back Home" by Gym Class Heroes featuring Neon Hitch, which peaked at #12 in February, dips from #17 to #18 in its 18th week. It's a far bigger hit than the previous highest-charting song whose title started with that provocative word. Eminem's "Ass Like That" peaked at #60 in 2005…Adele lands her fourth straight top 20 hit as "Rumour Has It" jumps from #23 to #20 in its 18th week.

"Mercy" by Kanye West, Big Sean, Pusha T and 2 Chainz leaps from #38 to #21 in its second week. Digital sales rank: #9 (154K)… Taylor Swift's "Eyes Open" jumps from #29 to #23 in its fourth week. The song has climbed as high as #19…Usher's "Climax" jumps from #30 to #25 (its highest ranking to date) in its eighth week. The song also jumps to #1 on Hot R&B/Hip-Hop Songs. It's Usher's 12th #1 R&B hit...Blake Shelton's "Drink On It" drops from #39 to #42 in its 12th week. The song also jumps to #1 on Hot Country Songs. It's Shelton's 11th #1 country hit.

Jason Mraz's

"I Won't Give Up" jumps from #57 to #49 in its 15th week. The song has climbed as high as #8. Mraz's new album Love Is A Four Letter Word will enter The Billboard 200 at #1 or #2 next week. You already know that if you read Chart Watch: Albums. If you missed it, here's a link.

"Faded" by Tyga featuring Lil Wayne jumps from #58 to #50 (its highest ranking to date) in its 13th week…Ellie Goulding's "Lights" jumps from #60 to #54 in its 17th week. The song tops the 1 million mark in digital sales this week…"Safe & Sound" by Taylor Swift featuring The Civil Wars drops from #56 to #60 in its 14th week. It has climbed as high as #30. The song tops the 1 million mark in digital sales this week. It's Swift's 15th million-seller, which is more than the next two most prolific country hit-makers combined. Carrie Underwood has had eight million-selling digital hits. The Zac Brown Band has had six.

One Direction's "One Thing" jumps from #75 to #62 in its third week..."Beez In The Trap" by Nicki Minaj featuring 2Chainz jumps from #78 to #63 in its second week…Of Monsters And Men's "Little Talks" jumps from #92 to #80 in its second week…Ca$hOut's "Cashin Out" is the week's second highest new entry at #81. The sing-along hit shot from #25 to #14 on last week's Hot R&B/Hip-Hop Songs chart and is expected to make another nice jump this week.

Pitbull's

"Back In Time" re-enters the chart at #83. It has climbed as high as #79. The song effectively samples Mickey & Sylvia's 1957 classic "Love Is Strange," which was memorably featured in the 1987 movie Dirty Dancing and on its best-selling soundtrack. This marks the second time in less than 18 months that a song from that movie has been sampled on a pop hit. The Black Eyed Peas' "The Time (Dirty Bit)" featured a good bit of "(I've Had) The Life Of My Life" by Bill Medley & Jennifer Warnes. The Peas' song hit #4 in December 2010.

"Love Is Strange" was considered exotic and carnal in 1957, when white-bread hits by Pat Boone and Debbie Reynolds dominated the chart. Fifty-five years later, that hook still sounds sexier than anything else on pop radio.

"Love Is Strange" was voted into the Grammy Hall of Fame in 2004. You may be surprised to learn that it didn't quite make the top 10 when it was first released. It peaked at #11 in March 1957. Sadly, Sylvia Robinson (the Sylvia in Mickey & Sylvia) didn't live to see Pitbull's revival of her song. She died on Sept. 29 at age 75.

Juliet Simms' cover of The Police's classic "Roxanne" debuts at #86. Simms is a contestant on The Voice. The Police's original version reached #32 in 1979. "Roxanne '97 (Puff Daddy Remix)" by Sting & The Police featuring Pras hit #59 in 1998…Gloriana's "Kissed You (Good Night)" jumps from #97 to #88 in its second week.

"Think Like A Man" by Jennifer Hudson & Ne-Yo featuring Rick Ross debuts at #90. It's the title song from a movie which is based on a book by Steve Harvey. The soundtrack enters The Billboard 200 at #33 this week. It blends songs by such current stars as John Legend and Kelly Rowland with old-school classics by Earth, Wind & Fire and Luther Vandross.

"Tonight I'm Lovin' You," the racy 2011 smash by Enrique Iglesias featuring Ludacris & DJ Frank E, tops the 3 million mark in digital sales this week. It's the second 3 million-seller for Iglesias, following "I Like It" (featuring Pitbull), which has sold 3,749,000 copies. It's Ludacris' fourth 3 million-seller as a featured artist, following Taio Cruz's "Break Your Heart" (3,668,000), Justin Bieber's "Baby" (3,591,000) and Usher's "Yeah!" (which also featured Lil Jon, 3,443,000). The odd part? Ludacris has yet to land a 3 million-seller as a lead artist. His top-seller on which he's in the lead is his 2010 hit "How Low," which has sold 2,191,000 copies.