The pianist played with the Beatles, the Stones, the Who and more, but remains little known beyond insider circles. This loving doc asks why – but leaves some questions unanswered The pianist played with the Beatles, the Stones, the Who and more, but remains little known beyond insider circles. This loving doc asks why – but leaves some questions unanswered T his documentary is probably, as they say, one for the heads – for connoisseurs who appreciate a great musician who was never a star. But