Which 20th-century Spanish virtuoso is widely credited with establishing the classical guitar as a respected concert instrument through his many transcriptions and performances?

Andrés Segovia

Segovia expanded the guitar's repertoire by transcribing works originally written for instruments such as the lute, harpsichord, and violin, including music by J.S. Bach. He also encouraged or commissioned new works from composers including Manuel Ponce and Heitor Villa-Lobos.