Classical guitar was playing in concerts around the world, popularizing his modern classical guitar, as well as a new style of music in the 1920s: Spanish romantic-modern style with guitar works by Moreno Torroba, de Falla, etc. Some people consider it to have been this influence of Segovia which led to the domination of the Torres instrument. Factories all over the world began producing them in large numbers. It was the 19th century classical guitarist Francisco Tárrega who first popularized the Torres design as a classical solo instrument. Composers of the Renaissance period who wrote for four course guitar include Alonso Mudarra,
Ten-string classical guitar of Yepes Ramírez III considered adding sympathetic strings to the classical guitar. He sought advice from the leading classical guitarists of the time, notably Andrés Segovia and Narciso Yepes, both of them players of Ramírez six-string guitars. Eventually they came up with a ten-string guitar. In "Ser Instrumento", Yepes mentions that the reasons that led him to carry out the "design" ("diseño"), of his instrument were acoustical/physical (""físicas"") and musical (""musicales""). After some "initial protest" that the 10-string guitar envisioned by Yepes was "impossible" to construct, Ramírez agreed to the commission and completed the first of these instruments in March 1964. Yepes