Live Earth hero Dave Grohl has mentioned Steely Dan as a big influence on the Foo Fighters during the making of their sixth album, and after an advance listen to September 25s Echoes, Silence, Patience and Grace, we know why: Echoes has a distinct 70s-rock undercurrent. There are sonic references to early-70s Zeppelin, late-era Beatles and Bruce Springsteen tossed throughout the otherwise typically loud, brawny and stadium-ready power tunes.