Composed and interpreted by Yorgos Kertsopoulos the "Passo Doble" in concert at the Muzart Festival, Helexpo Palace, Athens, 20 April 2008, on a double course guitar tuned in octaves. In 1948 A.Segovia introduced the nylon string aesthetic of A.Augustine. The classical and flamenco guitar enjoys this aesthetic for more than sixty years and J.Bream, J.Williams, D.Fampas, the Romero family, C.Parkening, Alirio Diaz, R.Dyens, L.Almeida, Paco de Lucia, P.Pena, C.Montoya, Sabicas, Serranito are only a few of the guitarists that play and have played with great success this aesthetic which has worldwide acceptance today. A.Barrios and H.V.Lobos played with metal strings while D.Prat, A.Lauro, F.Tarrega, R.Montoya played with gut strings. At the time of M.Giuliani, M.Carcassi, L.Legnani, F.Carulli, F.Sor, D.Aguado the guitar was strung with metal, gut and silk strings and had either double courses or single strings. Also further back in history L.Roncalli, G.Sanz, Bermudo, Brescianello played the guitar in higher pitched tunings and also the triple strung guitarra battente was popular mainly in Italy. Y.Kertsopoulos introduced in 1994 the Kertsopoulos Aesthetics which as a multiplex open architecture scheme provide the possibility of reviving and realizing the many faces of the guitar's aesthetics, as they have been recorded in history. Among many guitarists that play the aesthetics Smaro Gregoriadou has made many succesful first world presentations of different aspects of aesthetic styles in guitar interpretation.This topic has started to include single, double and triple course guitar interpretations of Spanish and latin works including flamenco and your participation and feedback will greatly be appreciated.