Avenged Sevenfold released an album.
Avenged Sevenfold . Avenged Sevenfold emerged with a metalcore sound on the band 's debut Sounding the Seventh Trumpet . Despite his death , Avenged Sevenfold continued on with the help of now-former Dream Theater drummer Mike Portnoy and released and toured in support of its fifth album Nightmare in 2010 , which debuted on the top spot of the Billboard 200 , Avenged Sevenfold 's first number one debut . The Stage is their first conceptual album and it marked another stylistic change for the band , moving towards the progressive metal sound .