Despite being released in January 2011, Adele's 21 is the only album that has sold more that one million copies this year.

At the midway point in 2012, Adele's sophomore album is the year's biggest seller in the U.S. 21 has sold 3.69 million copies according to Nielsen SoundScan; the only other album to come close to Adele's sales is Lionel Richie, whose album Tuskegee sold 912,000 copies.

Meanwhile, "Somebody That I Used to Know," the hit single by Gotye, has sold 5.5 million copies, making it the biggest of the year so far in the States.

Adele has had a tremendous year already, both professionally and personally. Not only did 21 spend 24 nonconsecutive weeks atop the U.S. albums chart, but the British songstress recently announced that she's expecting her first child with boyfriend Simon Konecki.

Gotye's year hasn't been too shabby either. "Somebody That I Used To Know," which topped the Billboard Hot 100 for eight consecutive weeks, has well over 269 million views on YouTube.

In Australia, "Somebody That I Used to Know" sat atop the singles charts for eight weeks, making it the highest charting song there since Savage Garden's "Truly Madly Deeply" in 1997. Not to mention that the song was covered on Fox's hit comedy "Glee," as well as performed by contestants on both "The Voice" and "American Idol."

It also hit No. 1 in New Zealand, Ireland, and Austria. In Poland, it stayed at No. 1 for a record 16 weeks, and his album was declared platinum after only one day.

The song is also the subject of a number of Internet parodies -- from "The Star Wars That I Used To Know" to this adorable dog and cat cover of the international hit.

Check out some of our other favorite "Somebody That I Used to Know" covers below.

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  • "Glee"

  • Ingrid Michaelson

  • Pentatonix

  • Chloe Bird

  • Ricardo Munoz

  • Walk Off The Earth

  • Jake Coco & Madilyn Bailey

  • Freak Morice

  • Sam Tsui

  • Myndset Remix

  • Matthias Harris

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