To get a remarkably true flavour of Quintessence jamming live, check out this nearly 16 minutes of black-and-white filming of the band playing Hyde Park in 1969. There's one amazing piece of dated psychedelic filming where the cameraperson tilts and focuses in and out for effect. Great singing and guitar work, and the number ends on a Hare Krishna chant. Whilst the picture quality is variable, the sound is very clear. A wonderful archive piece, here.