Real name: Guillermo Castillo Bustamante

Guillermo Castillo Bustamante was a Venezuelan musician (pianist) and composer (Caracas, 25 Jun. 1910 - 6 Oct. 1974), he joined the Septeto Habanero as a pianist in 1949.
Guillermo Castillo Bustamante should not be confused with Guillermo Castillo García, Cuban guitarist and composer ("Tres Lindas Cubanas"), founder of Sexteto Habanero, who died in 1949. Both also appear as Guillermo Castillo.