As the Foo Fighters continue their tour, it seems they've been trying to one-up Taylor Swift with her star-studded 1989 tour guest list. During the band's latest gig in Arizona on Friday, Jewel stepped out on stage for an unrehearsed cover of "Whole Lotta Love" by Led Zeppelin.

Towards the closing of the Foo set, Dave Grohl announced Jewel's presence, explaining that they planned to perform "some nice thing [they] thought would sound good." As Spin reports, the "Who Will Save Your Soul" singer decided against their plans last minute and insisted on launching into a remarkable, unpracticed version of Led Zeppelin's fan-favorite track, "Whole Lotta Love."

"She says to me, 'I don't want to do that,'" Grohl told the audience in Phoenix as Diffuser notes. "She says, 'I wanna do this.'"

Zeppelin songs have proven to be favored cover material and with so many artist's renditions, it's easy to ruin a classic. Jewel, however, carried the track with a slightly different vocal arrangement from Robert Plant's and nailed the song's high notes as it came to a close.

Grohl and company have introduced an impressive list of star power to the stage. Most recently, the group performed the Emmy-winning Sonic Highways track, "What Did I Do?/Go As My Witness" with Gary Clark Jr. during the same show he dedicated their classic track "Big Me" to a female fan with a similar issue as the front man--a broken leg. The "Best of You" performers also delighted fans in California by bringing out the mysterious Stevie Nicks and the sisters in Haim for a rendition of the famed Bella Donna track "Stop Draggin' My Heart Around."

Trumping all other guest performances, the former Nirvana drummer announced the presence of classic rock great's: Led Zeppelin's John Paul Jones and Queen's Roger Taylor for a superdupergroup rendition of "Under Pressure" in the UK.

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