I saw him nearly 40 years ago when I was a fresh-faced lad of 15. Allowed to sneak up the back stairs of the club and watch from wings, even my unsophisticated young taste couldn't fail to be totally mesmerised, despite being immersed in the folk-boom genre of the day.
Having opened my ears, I then discovered Django and the whole gypsy-jazz genre and have loved it ever since.
I think you instinctively know when you're in the presence of a genius!