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:  It was released digitally by Red Bull Records on May 18, 2010 for iTunes. " Megalithic Symphony: Megalithic Symphony is the debut studio album by American alternative rock band Awolnation, released on March 15, 2011 through Red Bull Records. Megalithic Symphony:  As of March 2015, the album sold 581,000 copies in the United States.
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