Named after a Cuban mountain range, the band Sierra Maestra was formed in Havana in the mid-1970s. This group of nine musicians is known for having revived the son tradition. Later, its leader, Juan de Marcos Gonzáles, continued the work of preserving the son heritage as a member of the Buena Vista Social Club and the Afro-Cuban All Stars. In 1981, the group released Sierra Maestra llego con el guanajo relleno, planting the first seeds of what was to become a rich discography. As a result of several tours abroad, his music would soon be heard beyond Cuba's shores. In 1988, Sierra Maestra's A los rumberos de Bélen could be heard on the soundtrack for The Milagro Beanfield War. Their album Sonando ya was released in 2010.