He used the guitar to tack a blistering, brilliant coda onto "Going Down the Road Feelin' Bad," which, up until that point, had been a twinkly white-boy jive. And to drive "Gravity" and a surprisingly funky "I Don't Trust Myself (With Loving You)" to stunning Hendrixian climaxes.
It was Mayer's guitar that added propulsion to the loping quality of his new material. And there was a mountain of that to work through. Sidelined for more than two years with a serious throat ailment, he introduced a number of fresh entries to his concert repertoire - from "Queen of California" which kicked off the show, to "I Will Be Found (Lost at Sea)," the stirringly spiritual encore that Mayer pounded out on the piano.
The voice was not as supple as in previous years, but the singer was in infectiously high spirits. At times, as on "Half of My Heart," his exuberance verged on goofy indulgence.
But he also provided a bounty of musical highlights, like his scintillating spidery solo on "Paper Doll" from Paradise Valley to his falsetto cover of Marvin Gaye's "Inner City Blues (Make Me Wanna Holler)," which emerged in the middle of "Waiting on the World to Change."
On "If I Ever Get Around to Living," Doug Pettibone put away the lap steel to join Zane Carney and Mayer on guitar, the three of them playing a ringing riff in unison.
Mayer's new album, Paradise Valley, reflects his love for his spread in Montana, but he took the stage looking like a parody of a poser, a Hollywood homesteader, with a turquoise and silver Native American amulet around his neck and a long piece of fabric tied around his head and trailing down his back. But his musical instincts remain as astute and genuine as ever.
Phillip Phillips opened the show with a long, shambling and strummy set, which also included a falsetto detour into Gaye territory for "Let's Get It On."
The season 11 American Idol winner, like Mayer early in his career, has been pigeonholed as a Dave Matthews wannabe. But while Mayer quickly escaped the label, Phillips seems determined to embrace it.
Contact David Hiltbrand at firstname.lastname@example.org or follow on Twitter @daveondemand_TV. Read his blog at www.inquirer.com/daveondemand.