"BIG THINGS" indeed from Purity Ring. The duo just uploaded their cover of Soulja Boy's "Grammy" which caused their server to crash. They then uploaded the track to YouTube which you can hear below. If you didn't know it was a Soulja Boy cover you would swear that this was originally theirs. The song is pulsating and hot.
Listen to the cover below and if their servers are back up you can download it here.