 In the week commencing 18 July 2011 , " Somebody That I Used To Know " debuted at number 27 on the ARIA Singles Chart . It was released on 5 July 2011 in Australia and New Zealand by Eleven Music as the second single from his third studio album , Making Mirrors ( 2011 ) . Despite an initial lack of airplay on major radio stations , the song reached number 1 in the week ending 15 August , becoming the first single by either artist to do so and their most successful single . Until 2014 , the song was one of the two second @-@ longest @-@ running Australian number @-@ one songs , with eight weeks at the top , tied with Savage Garden 's 1997 song " Truly Madly Deeply " , and behind Daddy Cool 's 1971 hit " Eagle Rock " , which stayed there for ten weeks . On August 2011 the song was released in Belgium and the Netherlands . After a few weeks in the charts , it reached number 1 in both countries , topping the Belgian Singles Chart for 12 weeks . Also in August , " Somebody That I Used To Know " debuted at number 4 in New Zealand on the RIANZ Singles Chart , reaching number 1 three weeks later , thus making Gotye the first Australian artist to reach number 1 since Guy Sebastian did so in February 2011 with " Who 's That Girl " . The song debuted on the Irish Singles Chart on 13 January 2012 at number 47 , later reaching number 1 position . In the United Kingdom , " Somebody That I Used To Know " spent five non @-@ consecutive weeks at number 1 . 
