Orestes López Valdés, nicknamed Macho, was a Cuban multi-instrumentalist, composer and bandleader. As a double bassist he was a founding member of the Havana Philharmonic Orchestra, and later a member of the National Symphony Orchestra of Cuba. A long-time member of the charanga Arcaño y sus Maravillas, where he played cello and piano, he is considered the co-creator of the mambo, together with his brother Israel "Cachao" López, and one of the most prolific danzón composers of the 20th century.

Arcaño y sus Maravillas was a Cuban charanga founded in 1937 by flautist Antonio Arcaño. Until its dissolution in 1958, it was one of the most popular and prolific danzón orchestras in Cuba, particularly due to the development of the danzón-mambo by its two main composers and musicians: Orestes López and his brother Israel López "Cachao" (bass). Such upbeat version of the danzón served as a precursor of the mambo popularized by Pérez Prado, as well as the chachachá created by Enrique Jorrín, a violinist who started his career in the Maravillas. Other important musicians in the Maravillas were pianist Jesús López, timbalero Ulpiano Díaz, violinist Félix Reina and flautist Eulogio Ortiz.