THE world’s largest independent rock and pop music archive, featuring stars from Jimi Hendrix to Elvis Costello and from Janis Joplin to Madonna, is to be opened for the first time. Up to 100,000 songs recorded and filmed between 1966 and 1991 by Bill Graham, the American concert promoter, languished in an underground basement in San Francisco for more than 10 years after his death. Then it was bought by Bill Sagan, a health company executive turned rock entrepreneur, who has now launched negotiations aimed at securing the stars’ permission to release their music. This weekend he was flying to...