If Marty McFly was born in 1968 and learned to play Johnny B. Goode on guitar in 1985, then went back to 1955 and played it at the Enchantment Under the Sea dance where Marvin Berry, Chuck Berry's cousin, calls Chuck to tell him about this "new sound" and Chuck Berry later writes and records it in 1958, what Marty learned to play in 1985… who actually created the song?