Underground by Thelonious Monk is my favourite. And also Bridge Over Troubled Water, because if you put your finger on Simon's face it looks like Garfunkel has a huge handlebar moustache
I've started having sober Sundays at festivals. It's really cool - you end up drinking things you wouldn't normally drink, and you don't have that shitty after-feeling when you're packing away...am I old? Lol
I did it in 2008, and it was a great experience. Don't even feel like you have to make friends. It's brilliant when you can just wander and enjoy your own company.