This one was recorded in Berkley in Sept, 1973... I never saw the tour with Santana, but I saw McGlaughlin with the Mahavishnu orchestra several times in the early 70's....I was still in high school when I saw them the first time...and it was truly an amazing experience...never heard a guitar played like that, with such powerful music.....It still moves me when I hear it after all these years...I also saw them at the concert that ended up as their live album, Being and Nothingness....Take care, Eric