In 2008, "Kerrang!" released "", an album composed of Iron Maiden cover songs performed by Metallica, Machine Head, Dream Theater, Trivium, Coheed and Cambria, Avenged Sevenfold, and other groups influenced by the band. In 2010, Maiden uniteD, an acoustic tribute band consisting of members of Ayreon, Threshold and Within Temptation, released "Mind the Acoustic Pieces", a re-interpretation of the entire "Piece of Mind" album. Many other Iron Maiden cover albums exist (each featuring various artists), including piano, electro, string quartet and hip-hop tributes.