In May 2011, Steve Angello began work on his second album with Swedish House Mafia with the release of the single "Save the World" featuring vocals from Swedish singer John Martin. In the summer Swedish House Mafia again performed at Tomorrowland and released two more songs in the winter named "Antidote" and "Greyhound". In July 2012, Swedish House Mafia again performed at Tomorrowland for the third consecutive year, this time heading the event and opening Night 2. In September following a successful summer of live performances, Swedish House Mafia released their most commercially successful track "Don't You Worry Child", again featuring the vocal of John Martin which reach number 1 in Sweden, Australia, and the UK and was a multiplatinum song in many countries. This would feature on Swedish House Mafia's second studio/compilation album "Until Now" along with all previous Swedish House Mafia singles plus Angello's 2012 collaboration with British DJs Third Party, "Lights" in addition to his remix of Pendulum's "The Island". "Until Now" was released on 19 October 2012. 2012, also saw Angello launched Size TV, in which Angello allows camera to record his personal and working life, in addition to releasing a first non-compilation studio album in entitled "People of the Night" in collaboration with AN21 & Max Vangeli, of whom Angello often tours with.