Israel López Valdés, better known as Cachao, was a Cuban double bassist and composer. Cachao is widely known as the co-creator of the mambo and a master of the descarga. Throughout his career he also performed and recorded in a variety of music styles ranging from classical music to salsa. An exile in the United States since the 1960s, he only achieved international fame following a career revival in the 1990s.

A descarga is an improvised jam session consisting of variations on Cuban music themes, primarily son montuno, but also guajira, bolero, guaracha and rumba. The genre is strongly influenced by jazz and it was developed in Havana during the 1950s. Important figures in the emergence of the genre were Cachao, Julio Gutiérrez, Bebo Valdés, Peruchín and Niño Rivera in Cuba, and Tito Puente, Machito and Mario Bauzá in New York. Originally, descargas were promoted by record companies such as Panart, Maype and Gema under the label Cuban jam sessions. From the 1960s, the descarga format was usually adapted by large salsa ensembles, most notably the Fania All-Stars.