My brother back home in England just reminded me about the inaugural John Peel Day, taking place for the next several hours. This particular section of the website is amazing: the top 125 Peel sessions of all time.
The list is fun to play with: pick seven bands in a row, alphabetically, for a one-day music festival. (To take place, shall we say, at the ballpark in Coney Island.) I'd go for this line-up:
Godspeed You Black Emperor!
Gorky's Zygotic Mynci
Guided By Voices
Half Man, Half Biscuit