In tandem with his multi-instrumentalist brother Orestes, bassist Israel "Cachao" López introduced to Cuban music the African rhythms that transformed the island's traditional danzón into what is now known as the mambo -- he also pioneered the descarga, the late-night jam sessions that revolutionized the sound and scope of Afro-Cuban pop and jazz. Born in Havana on September 14, 1918, just over a decade after Orestes, Cachao was the product of a sprawling, multi-generational musical family. At age eight he joined a local children's septet that featured singer Roberto Faz, hims...