Classical guitar may vary, but the typical shape is either "modern classical guitar" or that "historic classical guitar" similar to the early romantic guitars of France and Italy. Classical guitar strings once made of gut are now made of such polymers as nylon, with fine wire wound about the acoustically lower (bass side) strings. A guitar family tree may be identified. The flamenco guitar derives from the modern classical, but has differences in material, construction and sound. Today's "modern classical guitar" was established by the late designs of the 19th-century Spanish luthier, Antonio Torres Jurado. The classical guitar has a long history
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