We went to the Kennedy Center many times during our time in Washington...every evening at 6PM they present a free concert on the Millenium Stage which is broadcast live on the internet...these two concerts were the best that we saw...You can watch any show on the archives of the Kennedy Center Millenium Stage concerts...the Italian group Canzoniere Grecanico Salentino were unbelievable...very hyponotic!!! that show was one of the most otherwordly musical events of our entire lives!!!! Sofia Rei is originally from Argentina...she lives in New York City... we bought her CD.. i spoke with her after the show... her family in Buenos Aires lives in the same neighborhood where our apartment is located (San Telmo)...

These photos were actually 'captured' from the internet archive broadcasts which you can find at the links below.
Canzoniere Grecanico Salentino:
http://www.kennedy-center.org/explorer/videos/?id=M4895
Sofia Rei:
http://www.kennedy-center.org/explorer/videos/?id=M4893&type=A