In 1932, Segovia met and befriended composer Mario Castelnuovo-Tedesco in Venice. Since Castelnuovo-Tedesco did not play the guitar, Segovia provided him with guitar compositions (Ponce's "Folias" variations and Sor's "Mozart Variations") which he could study. Castelnuovo-Tedesco composed a large number of works for the guitar, many of them dedicated to Segovia. The Concerto Op. 99 of 1939 was the first guitar concerto of the 20th century and Castelnuovo-Tedesco's last work in Italy, before he emigrated to the United States. It was premiered by Segovia in Uruguay in 1939.