His parents were "Dr. Gregorio Caba, a distinguished Bolivian doctor, and Adelina Balsalia, an Italian lady of high culture and with a fine musical spirit".
In 1927, he obtained a scholarship by the Bolivian government allowing him to improve his skills in Madrid where he was the alumnus of Joaquín Turina and of Pérez Casas.
[13][page needed] Ninon Vallin, the French soprano who often stayed in Buenos Aires and was present at twenty seasons of the Teatro Colón, has also interpreted Caba's works.
Caba no es un folclorista, en la estricta acepción de la palabra, sino un compositor intuitivo, que crea sus motivos como lo hacen los mismos indígenas, es decir, tratando de transmitir sus tradiciones, danzas y cantares, porque él mismo se siente engendro del terruño, indio también.
[15][page needed]A representative example of Caba's music is his dance Kollavina, recently interpreted by the Bolivian guitarist Marcos Puña, and presented in the book of the two aforementioned musicologists.