It's been long known that jazz trumpeter Davis and guitarist Hendrix had been toying with plans to record together in the year before Hendrix's sudden death in 1970. But a piece of memorabilia, which has been on display at the Hard Rock Cafe in Prague, confirms that they were also trying to recruit McCartney as the bass player. Williams, one of the best jazz drummers of the 1960s, was also lined up for the group.