>i understand there's some rivalry between Blur and Oasis, what's that all about?
It was mostly manufactured by the media, but they were the two-most prominent Britpop bands in the mid-90s. Oasis was from the north of England, and Blur was from the south - this played into the traditional/stereotypical divide/rivalry between the two halves of the country

Northerners are traditionally portrayed as poor, hard, tough, uneducated, working-class people, while southerners are usually portrayed as rich, soft, poncey, educated, middle-class and upper-class people. In reality it was never that clear-cut, but there's elements of truth to it and it's a stereotype that still persists, so the media latches onto it whenever they can