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,
Classical guitar pedagogy journals (e.g. via JSTOR, ProQuest) which simplifies the process of locating relevant data, studies and citations for their own research. Brad Conroy's lesson on simple right hand arppegios Bibliography at the end of the article Classical guitar pedagogy The classical guitar is today a standard instrument that can be studied at music universities and conservatories. Numerous education publications are available, from guitar-related books, to musical style, etc. There are also institutions that offer worldwide graded music exams. Examples include: Articles which consider graded exams in the context of the classical guitar have been written by the EGTA (European Guitar Teachers