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Out runs Dave Grohl, baby-blue guitar in hand, that scruffy full-bodied mop of hair flailing behind him and the rest of the Foo Fighters in tow as they launch straight into All My Life.
And there is little let-up for the next two and three-quarter hours - that is except for Grohl's many chats with the crowd and a few lingering moments, such as the ambient interlude during Monkey Wrench that makes some diehards restless.
They rip through The Pretender (during which Grohl does an Angus Young down the runway stage), Learn To Fly, and a clutch of songs off their new - and possibly best - album Wasting Light, including a blazing White Limo and These Days ("My favourite song I ever wrote in my life," proclaims Grohl).
While it's taken 17 or so years, the Foo Fighters are now a stadium-sized rock band and the near 45,000 people at Western Springs are testament to it. Not many bands have the pulling power to play the Springs these days.