This pair come on like royalty here, dipping into jazz, classical music, and Gershwin for inspiration. And they've come a long way.
Omara is best known as the mature female star with Buena Vista Social Club  [DVD
], but that was only the latest stage in an extraordinarily eventful career.
Born in 1930, she initially decided to follow her sister Haydee and become a dancer, and she even set up as a dance teacher for a while.
But - known as "Miss Omara Brown, the girlfriend of feeling", she soon branched out into singing, drawing on all the styles - from Argentina, Brazil, and the USA - which were pressing in on Cuba in the early 1950s.
She set up a vocal quartet with which she toured the US and shared the stage with Nat King Cole, and when the missile crisis of 1962 set off Cuba's long period of isolation, she decided to stay there and start a solo career.
She also did her bit for her country's economy, serenading those pressed into service cutting sugar-cane. Meanwhile she joined the celebrated Orquesta Aragon, with which she recorded a string of albums.
Then in the 1990s her boat came in. She recorded with Compay Segundo, Ibrahim Ferrer, and Ruben Gonzalez: all gone now, but living on through their surviving collaborators.
Chucho Valdes has come via a different route, but - being named by Bill Brubeck as one of the world's five top jazz pianists, alongside Bill Evans, Oscar Peterson, Herbie Hancock, and Chick Corea - he brings his own stardust.
And as he and Omara launch into their own treatments of Hollywood standards and Beethoven's "Moonlight" sonata, with Omara's voice a bit threadbare but still its splendid self, the old magic works again.