I've seen Murray on most of his UK visits (trio, quartet, quintet, octet, gokwa, big bands). Musically he's always been very impressive and generally seems to want to play. There was only one occasion when he seemed less than happy - that was at a festival, notorious for its short sets, with his all star 'Ellington' big band. Stunning music that was over almost as soon as it began. Maybe it was the just short set, who knows, but he was definitely less than happy on that occasion.