Foo Fighters fifth and definitive album opens with a statement of purpose universal in its passion. Dave Grohl could be singing to his wife, bandmates Nate Mendel, Taylor Hawkins and Chris Shiflett, or to any and every fan listening to the song. In truth, the song and the double album — one heavy as fuck, the other subtly laid back — are dedicated to all of the above: the friends, family and fans that have made the decade-long Foo Fighters odyssey possible.