Task: Explanation
Input (English): Megalithic Symphony is the debut studio album by American alternative rock band Awolnation, released on March 15, 2011 through Red Bull Records. The album is the band's first full-length release, following the release of the extended play "Back from Earth" (2010). "Megalithic Symphony" has since peaked at number 84 on the United States "Billboard" 200 and at number 57 on the Austrian Albums Chart. As of March 2015, the album sold 581,000 copies in the United States. Question: 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? Answer: Megalithic Symphony
Output (English):  As of March 2015, the album sold 581,000 copies in the United States.