How many Buena Vista Social Clubs are there?

Our treat on our last evening in Havana was to go, as a group, to the bar of that name. We were on the balcony and the band lept onto the stage. Well, there was not really a stage and they could not have lept anyway! They looked very authentic (old!) and certainly put maximum effort into playing and singing non-stop for 11/2 hours of fierce rhythm, while the bar staff delivered our 3 free drinksI yes, 3!
Accompanying the band were a couple dancing smooth exotic salsa. They danced nearly the whole time and they climbed the stairs to our balcony and performed in the two square yards of space. They had various people up to dance and I had a good 30 seconds of being led, but I enjoyed it. Cheryl was not invited to dance but got a kiss! By the end of the evening half the audience were on their feet in a conga (last attempted by me at a holiday camp when  I was 12) that circled the floor. Most people managing to copy the professional couple in time to the music.
It was a good evening, more or less as expected but a number of our group were disappointed.
Earlier in the evening we were almost part of a possible scam when a friendly couple showed us another bar with the BVSC playing at the same time, and offered to get us tickets. Maybe genuine, maybe not.