Behind the scenes
While Marvin Berry was fictitious, Chuck Berry, was one of the pioneers of rock music, and had his first Top 40 hit earlier in 1955 with Maybellene. Though Berry wrote Johnny B. Goode in 1955, it would not be released until three years later. As this would seem to have created an ontological paradox, some commentators were offended by the idea that "Marty the white kid teaches Chuck Berry how to make blues-influenced black rock and roll music" .
Fans have pointed out that, by the time Marvin has gotten Chuck to "listen to this", Marty has departed from "Johnny B. Goode", has stopped singing, and has moved into a heavy metal jam of his own. When Marty has finished, it's clear that Marvin is no longer on the telephone with Chuck. Furthermore, the fact that Marty (who from the original timeline in which he did not go back in time) was familiar with the song indicates Chuck originally conceived of the song without any help from Marty. This is further suggested by the historical Berry's acknowledgement that the song was semi-autobiographical .
However, it is still possible that the Chuck Berry of Timeline 2 (created by Marty's first 1955 trip) was at least partly inspired by Marty's "new sound". One possible scenario is that Marvin, a musician in his own right, later played Chuck a sample of Marty's version of the song, to show what he'd had in mind during the phone call.
- Back to the Future (Mentioned only)