Which debut album has sold over half a million copies in the United States and is by an American alternative rock band that released its first digital debut EP on May 2010 of a different album?
Back from Earth: Back from Earth is the debut EP by American alternative rock band Awolnation. Back from Earth: Sail", "Burn It Down" and "Guilty Filthy Soul" appear on "Megalithic Symphony", the band's debut album. Megalithic Symphony:  As of March 2015, the album sold 581,000 copies in the United States.
i don't know