Noel and Liam introduced a lot of Americans to Man City. Thanks to the Internet, social media and TV that sort of thing isn't really necessary, but many years ago you just wouldn't have heard of any team but United unless you were a a big soccer fan in general and made a serious effort to follow a sport from another country.
So on top of always being my favorite musician, I'll always be thankful to him for making me a City fan.
P.s. Met my wife back in college (2003) because she was wearing an oasis shirt. Went up to her after class finished and we were immediately on the right track. Later proposed to her in the crowd during a HFB show.