I'm now surfing those sites, thanks thanks very much to all, and every additional suggestion will be much appreciated. Indeed this group of ladies is fantastic. They have already earnt the sponsorship of the Secretary of Culture of Buenos Aires City, but (Alas) the sponsorship is only moral, if it can be.

If their director Elsa Sagras insists, I could be singing with them some music-hall or cabaret songs. I'm not sure whether I'll be able to do it, but if I can, it would be an honor for me to contribute a bit.

Un abrazo,
Andrés (as Phil Collins says, I can't dance)