My music - Classic Rock, Southern Rock and Country - some new stuff too 
Clothes - Plain and/or preppy (as someone called me, I took offense). Usually jeans and a tshirt, or somewhat fancier jeans and a button up shirt or one of them polo shirts. 
Hobbies - War games (COD, MOH), computers, tinkering, cars 
I don't think I fit in a group.