In January 2011, Luka Šulić, along with friend and fellow cellist Stjepan Hauser, performed a cover of Michael Jackson's Smooth Criminal which was played solely on cello. They uploaded it on Youtube under the nickname 2Cellos. In just a few days, the music video became a YouTube sensation. The Smooth Criminal Songfacts states that they appeared on the Michael Jackson-themed January 31, 2012 episode of Glee performing the song with Naya Rivera and Grant Gustin. Šulić and Hauser's debut album with Sony Music Entertainment was released in mid June, 2011.