It's not quite right to say that the Foo Fighters only have one sound, but why does it always feel like the group constantly mines the same sonic vein? Even on 2007's Echoes, Silence, Patience & Grace – their sixth album and first with producer Gil Norton since their second, 1997's The Colour and the Shape – the Foos feel familiar, although the group spends some palpable energy weaving together the two sides of their personality that they went out of their way to separate on 2005's In Your Honor, where they divided the set into a disc of electric rockers and a disc of acoustic introspection. Here, the Foos gently slide from side to side, easing from delicate fingerpicked folk (including "Ballad of the Beaconsfield Miners," an instrumental duet between Dave Grohl and guitarist Kaki King) to the surging, muscular hard rockers that have been the group's modern rock radio signature.