truth and he wanted to get as many people to try lsd as they can. >> so we started renting halls. we called the thing the acid test. the band of course was known as the warlocks. as time went on, they changed their name to the grateful dead. ♪ st. stephen with a rose, in and out of the garden he goes ♪ ♪ country garden in the wind and the rain ♪ ♪ wherever he goes, the people all complain ♪ >> lsd was not an illegal drug. when kesey held these acid tests, as they were known, they'd have two vats. one was punch and one was punch with lsd. >> the acid tests were like a party. the scene is a lot of light shows and music and people dancing. when the dead were playing, it was a way to feel that acid in waves. and i looked down and i saw kids in front of me moving to the music. they looked up at me and i said, "yeah."