Wasting Light is the Foo Fighters seventh studio album, released on April 12, 2011. Described as the band's "heaviest album yet," Dave Grohl states that: "With Echoes, Silence, Patience & Grace we were too concerned with being musical now it's time for us to be a rock band again." Although guitarist Pat Smear has performed live with the band since 2006, Wasting Light is the first album to feature him as an official member since 1997's The Colour and The Shape. The title is taken from the lyrics of the song "Miss the Misery". Guest musicians include Bob Mould and Krist Novoselic.