2. Gotye - 'Somebody That I Used to Know'
As Adele well knows, it's always a good idea to write a song about a nasty breakup. It's a topic most everybody can relate to. For Australian-Belgian artist Gotye, "Somebody That I Used to Know" was his ticket to international fame. He wrote and produced the song in his parents' barn in Australia, then brought in New Zealand singer-songwriter Kimbra to sing a verse. Appearances on Glee and American Idol helped it fly up the charts in America, and soon enough teenagers all over the country knew how to pronounce Gotye. It's one of the biggest-selling digital singles of all time.