<Table> <Tr> <Td> "Save the World" (2011) Save the World 2011 </Td> <Td> "Don't You Worry Child" (2012) Don't You Worry Child2012 </Td> <Td> "Reload" (2013) Reload 2013 </Td> </Tr> </Table> <Tr> <Td> "Save the World" (2011) Save the World 2011 </Td> <Td> "Don't You Worry Child" (2012) Don't You Worry Child2012 </Td> <Td> "Reload" (2013) Reload 2013 </Td> </Tr> <P> "Don't You Worry Child" is the sixth and final single released by Swedish house music supergroup Swedish House Mafia . It is the last single from their second studio album, Until Now, featuring vocals from Swedish singer John Martin . In the United States, it is the act's second number - one single on Billboard's Dance / Mix Show Airplay chart, following "Save the World". It received a Grammy nomination for Best Dance Recording in the 2013 Grammy Awards, as did its predecessor, "Save the World", the previous year . The song is written in the key of B minor . </P> <P> The song was announced during the Swedish House Mafia's tour of Australia while they played at Future Music Festival 2012 . They say it was made from the inspiration they took from the beauty of Australia . The title "Don't You Worry Child" was mentioned a few times, with hints from the group members themselves on their Twitter pages . When it was announced that the tour the Swedish House Mafia was about to set on would be their last, a farewell single was also announced--"Don't You Worry Child" being that single . The song had its live debut at the Swedish House Mafia's Milton Keynes Bowl concert and its radio debut on Pete Tong's BBC Radio 1 show on 10 August 2012 . The song contains a sample from the song "Be My World" by Italian dance act Milky . </P>

Who sings vocals on don t you worry child