Friday @ Lollapalooza: the Black Keys

Dan Auerbach from the Black Keys performs Friday at Lollapalooza

in Chicago’s Grant Park. (Sitthixay Ditthavong/Invision/AP)Friday night’s headliners tested fans with a black decision: see the newly reunited and infinitely influential heavy metal band Black Sabbath, or catch a widescreen performance by one of rock’s most rollicking and fresh duos, the Black Keys.

For Nathaniel J. Werner, 56, of Oak Park, the choice was clear.

“This is a bucket-list item,” he said, while awaiting the Black Keys. “Sabbath? Pfft! Seen that. These Black Keys — I like the blues, and these guys do that and more.”

That they do, and did.

Just as they proved themselves arena-worthy in March at Chicago’s United Center, the bold pair — guitarist Dan Auerbach and drummer Patrick Carney (and augmented on stage by a few extra players) — showed they could headline a massive summer festival just as easily.

Introduced briefly by Mayor Rahm Emanuel (pictured at right — no black keys to the city? anyone?), the Black Keys opened with “Howlin’ for You” and proceeded to get the audience doing just that, singing along instantly to the song’s da-da refrain. Swinging wide through their decade-old catalog, Carney pounded furiously and Auerbach sang firmly while wrenching riffs from his guitar. The sound these two knit together draws from clear influences old and new but never sounds indebted to anyone. Timeless, tuneful and catchy, even while still being sonically dirty and rough to the touch, songs like “Dead and Gone” cause heads to bob involuntarily and make redundant Auerbach pleas such as, “Come on, Chicago, sing it with us!”

Midway through the set, Auerbach and Carney dismissed their support players and woodshedded alone. But, proving their scope, they concluded the show with something much less intimate: a blast of fireworks that spelled out their name above the stage. Humble and audacious.