Los Fabulosos Cuatro:

Known by their original arrangements and well-produced songs, refined through the years, Los Fabulosos Cuatro started touring in the early '60s as Carlos Guzman y su Conjunto, changing their name to Carlos Guzman y Los Fabulosos Cuatro soon after achieving their first hit, a song called "Vestida de Blanco." Abelardo Jiménez, also known as "ChaCha," joined in after Carlos Guzman decided to go on his own; he was later replaced by Eddie Pérez. When Armando and Juan Hinojosa became the only original members in the band, they called themselves Thus Black Jack. Nevertheless, their English-language name was just temporary, changing it to Los Fabulosos Cuatro after teaming up with Ernie Ruiz and Laura Canales. ~ Drago Bonacich, All Music Guide