Thanks....all interesting stuff. I liked the Tirso clip most, and I doubt if there were more than a handful of Cubans, if any, in the crowd.
The crowd reaction is very "Cali". You can expect to see the same kind of atmosphere in most salsa concerts where the orchestra in questions has a healthy fan base.
Have a look at this clip of the great and legendary Roberto Roena and his Apollo Sound in concert in Teatro Jorge Isaac some years ago, performing their classic, "Guaguanco del Adios". See the way the crowd "takes over" the song, word for word, so much so that the singers stop and let public sing:
http://www.youtube.com/watch?v=Kz_INZQH81E&playnext=1&list=PL265E297ABCAE76D3
This is the type of salsa fanaticism that contributes to Cali's fame as the World Salsa Capital, where the music and the musicians are paid their due, as opposed to serving as accessories to dancers and theri performances. This is something that has to experienced to be appreciated!