What are / were the biggest rivalries in music?

Guns’N’Roses and Nirvana

Nirvana refused at some point to tour with Guns and also Kurt Cobain said that Guns N Roses write crap music. Axl Roses, being more temperamental, wanted to fight Kurt for this, but Kurt was very relaxed about, you just know how passive he was

• The Beatles vs The Beach Boys
• The Beatles vs Rolling Stones
• Megadeth vs Metallica
• Michael Jackson vs Prince
• Oasis vs Blur
• Gary Barlow vs Robbie Williams (after Robbie leaving Take That)
• Roger Waters vs David Gilmour (Pink Floyd)
• Noel Gallagher vs Liam Gallagher (Oasis – their fight led to splitting)
• Taylor Swift vs Calvin Harris (recent)
• The Beatles vs The Beach Boys
• Mariah Carey vs Whitney Houston
• Notorious B.I.G. vs. 2Pac
• Britney Spears vs. Christina Aguilera