On 19 May 2011, it was announced that the album would be released on 19 August, with its launch the following day at the Sydney Opera House as part of the Graphic Festival which would feature animators and a 10-piece orchestra as part of Gotye's performance. De Backer also released a follow-up single to "Eyes Wide Open" titled "Somebody That I Used to Know", featuring New Zealand musician Kimbra, which was released on 6 July 2011 and debuted at Number 27 on the ARIA Top 50 Singles Chart. The single quickly moved up the ARIA singles chart despite a lack of airplay on commercial radio stations. The song was further boosted by endorsements from Ashton Kutcher and Lily Allen via Twitter, exposing Gotye's music to their millions of followers. The single has gone on to reach 11× Platinum status (700,000 units sold) in Australia and 8× Platinum status (8,000,000 units sold) in the US. It has peaked at Number 1 in 18 countries including the Australian ARIA Singles Chart, the Belgian Singles Chart, the Dutch Megacharts, the German Media Control Chart, the Official UK Top 40 and the US "Billboard" Hot 100. "Somebody That I Used To Know" has been the Number 1 single on iTunes in 46 countries.