Another guest was guitarist Pat Smear, who had been a band member from 1995 to 1998, and a guest musician on the tour for In Your Honor. Smear, who has since been reinstated as a full-on member, described his participation as "the oddest recording experience I had with Foo Fighters" given he had no input in composition and was "going in and playing on a song that was already written". This is their first Foo Fighters' album, since The Colour and the Shape (1997) to feature Smear, before officially rejoining the band for their next album, Wasting Light in 2011.
Another guest was guitarist Pat Smear, who had been a band member from 1995 to 1998, and a guest musician on the tour for In Your Honor. Smear, who has since rejoined as a full-time member, described his participation as "the most unusual recording experience I've had with Foo Fighters" given he had no input in composition and was "going in and playing on a song that was already written". This is their first Foo Fighters' album, since The Colour and the Shape (1997) to feature Smear, before officially rejoining the band for their next album, Wasting Light in 2011.