Part of the writing and casting for the film was creating a supergroup of musicians across time for the film's conclusion. Solomon, Matheson, and Parisot ran through some of the most influencing musicians and centered on Jimi Hendrix, Louis Armstrong and Wolfgang Amadeus Mozart, played in the film by DazMann Still, Jeremiah Craft, and Daniel Dorr, respectively. In the case of Hendrix and Armstrong, they were able to secure rights to use the artists' likenesses for the film but were forbidden to use them within the film's advertising nor could they use any of their musical works. Christian Scott was brought in to provide instrumental performance for Armstrong, while Ray Suen provided both the piano and guitar performances for Mozart and Hendrix. They included Ling Lun, believed to be the creator of Chinese music, to help diversify the group, and while the legends around Ling Lun identify him as male, the producers opted to cast Sharon Gee as Lun to help round out the cast, given that the Bill & Ted series had never been beholden to historical accuracy. With Death as the group's bassist, they only needed a drummer and created the character of the cavewoman Grom for this, played by Patty Anne Miller, a real-life drummer for artists like Beyoncé and CeeLo Green. Tosin Abasi plays the "air guitar" riffs for Bill & Ted.
