This was a very real thing.
  1. The Britney Squad vs The Christina Aguilera Squad
  2. The N'Sync Squad vs The Backstreet Boys Squad
  3. The Taking Back Sunday Squad vs The Brand New Squad
    Brand New is technically 2000 and I listened to them both, but this might've kind of been a thing? Curious to see what people think about this.
  4. The West Coast Hip Hop Squad vs The East Coast Hip Hop Squad
  5. Oasis vrs Blur
    The Britpop rivalry at its hight.
    Suggested by @Waddy