Segovia's repertoire consisted of three principal pillars: first, contemporary works, including concertos and sonatas, usually specifically written for Segovia himself by composers with whom he forged working relationships, notably Spaniards such as Federico Moreno Torroba, Federico Mompou, and Joaquín Rodrigo, the Mexican composer Manuel Ponce, the Italian composer Mario Castelnuovo-Tedesco, and the great Brazilian composer Heitor Villa-Lobos; second, transcriptions, usually made by Segovia himself, of classical works originally written for other instruments (e.g., lute, harpsichord, piano, violin, cello) by Johann Sebastian Bach, Isaac Albéniz, Enrique Granados, and many other prominent composers; third, traditional classical guitar works by composers such as Fernando Sor and Francisco Tárrega. Segovia's influence enlarged the repertoire, mainly as a commissioner or dedicatee of new works, as a transcriber, and to a far lesser extent as a composer with such works as his "Estudio sin luz".