Steven Siro Vai is an American guitarist, songwriter, and producer. A three-time Grammy Award winner and fifteen-time nominee, Vai started his music career in 1978 at the age of eighteen as a transcriptionist for Frank Zappa, and played in Zappa's band from 1980 to 1983. He embarked on a solo career in 1983 and has released eight solo albums to date. He has recorded and toured with Alcatrazz, David Lee Roth, and Whitesnake, as well as recording with artists such as Public Image Ltd, Mary J. Blige, Spinal Tap, Alice Cooper, Motörhead, and Polyphia. Additionally, Vai has toured with live-only acts G3, Zappa Plays Zappa, and the Experience Hendrix Tour, as well as headlining international tours.

David Lee Roth is an American rock singer. Known for his wild and energetic stage persona, he was the lead vocalist of the hard rock band Van Halen for three stints: from 1974 to 1985, during 1996, and from 2006 to when they disbanded in 2020. He has also had a successful solo career, releasing numerous RIAA-certified Gold and Platinum albums. After more than two decades apart, Roth re-joined Van Halen in 2006 for a North American tour that became the highest-grossing in the band's history, and one of the highest-grossing of that year. In 2007, he was inducted into the Rock and Roll Hall of Fame as a member of Van Halen.