1964 - Navidad Zuliana - Conjunto Gaitero Los Guacos del Zulia - Sadel & Co. 

Side A

1. Alegría Navideña (José Chiquinquirá Rodriguez)
2. Gaita y Melodía (José Chiquinquirá Rodríguez)
3. Gaita Zuliana (José Castillo)
4. Los Venezolanos (Pedro Valbuena)
5. Maracaibo y Su Lago (José Castillo)

Side B

1 Mosaico Guaco (D.R.)
2. Navidad Zuliana (D:R.)
3. Tierra Marabina (D.R.)
4. Tilin Tilin (José Castillo)

Singer in all songs: José Castillo

Alfonso "Pompo" Aguado tells the story of how he and other guacos spent 4 days sleeping in cartboard boxes in Caracas in hopes of getting the mother of Alfredo Sadel to listen to their debut record. By this point they were teen students with a dream. Sadel's mom had a tiny record label and eventually she did release the album!

Here's a partial list of the founders of the group: Alfonso and Gustavo Aguado, Emersio and Edgo Aponte, Mario Viloria, Nelson Rada, Carlos Clavel, Spencer Urdaneta, José Castillo. Looks like Luis Rincón was there from the beginning as well. 

1965 - Maracaibo Cuatricentenario - Conjunto Gaitero Estudiantil Los Guacos del Zulia - Serfaty

Side A

1. Maracaibo Cuatricentenaria (José Chiquinquirá Rodríguez) - Gaita
2. El Gato y El Ratón (Mario Viloria) - Gaita
3. La Negra (José Castillo) - Gaita
4. Añoranza Zuliana (Mario Viloria) - Gaita
5. Camino A Belén (Mario Viloria) - Villancico (Christmas tune)

Side B

1. Gocemos La Navidad (L. Antonio Torres M. José Castillo) - Gaita
2. Tradición Maracaibera (José Chiquinquirá Rodríguez) - Gaita
3. Cantaba La Rana (D.R.) - Gaita 
4. Golpe Gaitero (Mario Viloria) - Gaita 
5. Gaita Al Folklore (Mario Viloria) - Gaita

This is first album to feature future vocalist and leader Gustavo Aguado, brother of Alfonso. (He might have participated in 1964 as a backing vocalist, however). He would come and go for a couple of years performing with Estrellas del Zulia in 1966 and studying a year abroad in Colombia, before returning for the rest of the 60s albums and staying with the band ever since. 

1966 - Festival Gaitero 

Side A

1. La Perrita
2. A Parrandear
3. Golpe Sabroso
4. Los Huecos
5. Los Maderos de San Juan

Side B

1. La Pájara Pinta
2. Maracaibo Mía
3. Fantasía Navideña
4. Regalo Infantil
5. Ritmo Excelente

Guaco's first hit was Los Huecos, which they got 3rd place in a gaita contest. It was their first song that got national attention.

1968 - El Obrero

Side A

1. Luna Navideña
2. El Obrero
3. Pascua Florida
4. La Navidad
5. Los Porrones

Side B

1. Las Monedas
2. La Mamunda
3. El Niño Dios
4. Maracaibo Cuatro Siglos
5. Lucero de Navidad

Nerio Franco joins and he would be playing cuatro, guitar and piano throughout his stint in Los Guacos. It seems he was also instrumental in refining their approach to dense backing vocals and he was listening to a lof of Aldemaro Romero and his Onda Nueva group. 

1969 - Maracaibo Cuatricentenario 1569 - 1969

Side A

1. Maracaibo Cuatricentenario
2. De Margarita
3. Remodelación
4. Horizonte
5. El Gallito

Side B

1. Gaita Con Botellas
2. El Hamponato
3. Parranda Y Son
4. Marabina
5. Viejos Gaiteros
6. Que Situación

The confusingly titled Maracaibo Cuatricentenario 1569-1969 (not to be confused with the album of the same name in 1965!) marks the arrival of future musical director Ricardo Hernández, who entered as a charrasquero.