The pop star soundtracked the unveiling to the Vitamin String Quartet cover of her No. 1 hit.
The Kelly Clarkson Show host had not one, but two pianists accompany her for the performance.
"He was one of the closest friends I ever had and I loved him immensely," brother Gary Lee Conner wrote.
The money was raised at his annual concert in November, which featured Dave Grohl, Nine Inch Nails and more.
Cody Jinks, Social Distortion, Joan Jett & the Blackhearts and more artists will also play the Milwaukee festival.
The album's lead single, "Tropic Morning News," is out now.
Her smash “Anti-Hero” spends an eighth week atop the Hot 100, becoming her longest-leading No. 1.
The song enters at No. 96.
The pop star will co-chair the annual event alongside Penélope Cruz, Michaela Coel and Roger Federer.
Three years after sexual misconduct allegations surfaced and amid an ongoing lawsuit, the producer appears to be taking a page from Louis C.K.'s playbook.
