Richie Havens’ page on Wikipedia:

As the festival’s first performer, he held the crowd spellbound for nearly three hours (in part because he was told to perform a lengthy set because many artists were delayed in reaching the festival location), and called back for encore after encore. Having run out of tunes, he improvised a song based on the old spiritual “Motherless Child” that became “Freedom”.

I bought two tickets for his upcoming concert in Paris.