Puerto Rican guitarist and songwriter, accompanying his daughters Hermanas Castillo

DO NOT CONFUSE: Guillermo Castillo is an ANV used by different artists:
- Guillermo Castillo García, Cuban guitarist and composer ("Tres Lindas Cubanas"), founder of Sexteto Habanero (later Septeto Habanero), died in 1949.
- Guillermo Castillo Bustamante, Venezuelan pianist and composer ("Escríbeme "), who joined the Septeto Habanero in 1949 (1910 - 1974).
- Guillermo Castillo, Guatemalan sound engineer