Roberto Sierra is an american composer, born in Vega Baja in Puerto Rico in 1953.
He studied composition with Ligeti, and is now professor at Cornell University in NYC.
He found a very personal style, incorporating in his work elements of folk music and folkloric Caribbean.
Among a long list of compositions for solo instruments and different ensembles, "Concierto Barroco" (for guitar and orchestra) takes its inspiration from a scene in Alejo Carpentier's eponym novel.
Here is the "Mambo 7/16" played by Cuarteto Latinoamericano
and you can also listen to Roberto Sierra' other works