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 by audiences in the USA. The classical guitar repertoire also includes modern contemporary works – sometimes termed "New Music" – such as Elliott Carter's "Changes", Cristóbal Halffter's "Codex I", Luciano Berio's "Sequenza XI", Maurizio Pisati's "Sette Studi", Maurice Ohana's "Si Le Jour Paraît", Sylvano Bussotti's "Rara (eco sierologico)", Ernst Krenek's "Suite für Guitarre allein, Op. 164", Franco Donatoni's "Algo: Due pezzi per chitarra", etc. Performers who are known for including modern repertoire include Jürgen Ruck, Elena Càsoli, Leo Brouwer (when he was still performing), John Schneider, Reinbert Evers, Maria Kämmerling, Siegfried Behrend, David Starobin, Mats Scheidegger, Magnus Andersson, etc. This