I thought it was Brahms versus Wagner.
Transcript of the dispute:
Person A: “Piano Concerto No. 18 in B-flat major.”
Person B: “Shut up, dawg, Toccata and Fugue in F major where it be at.”
Person A: “Piano Concerto No. 18 in B-flat major!”
Person B: “Toccata and Fugue in F major beeyatch.”
From there, the punches were dropped.