"I Wanna Take You Higher" by Sly and the Family Stone, and "Star Spangled Banner" by Jimi Hendrix--the first because it was so good and so new, and it changed the kind of music the "mainstream" listened to forever-SSB was the ultimate musical political act--it seemed to everyone(both pro and antiwar) that he was defacing the Star Spangled Banner(I was nearly expelled from college for playing it on my campus radio show, and tens of thousands of kids were forbidden to play the record)--

I didn't go, but had a number of friends who went(as well as some who didn't go, but claimed to have been there in later years!)--and the strangest thing about it is how people's memories of it changed after the movie came out--

It was the movie that made superstars out of folks like Ritchie Havens and Sly and the Family Stone and Joe Cocker, and to a great degree, secured its place as the defining event for a generation(though it really was the media event of a generation) The film performances, like SSB, were remembered--even though most of the people had actually left by the time Hendrix performed it(at the Woodstock site, they say that 320,000 of the 400,000 had packed it up and gone home) and most people were not aware of it til long afterwards--

it is really enlightening to look at the list of folks who actually played, but who are not associated with either the original film, or the album of the film-Grateful Dead, The Band, and Credence Clearwater Revival--You could have made an entirely different movie, and created entirely different memories for a generation if Martin Scorcese had like their footage more--