In August, for the eighth year, Trefor led a team of international guitarists tutoring and performing at the North Wales International Jazz Guitar Festival and Summer School in Wrexham. Appearances Skills Posted on January 1, 2008 ← For the third consecutive year, 2004-2006, Trefor toured California appearing in San Francisco and at John Pisano’s Guitar Night at Spazios, Sherman Oaks, L. A. During the tour, Trefor performed clinics for JazzMasters Workshops at Carmel, the first non American guitarist to do so and has since made another appearance in the Jazz Bar at the Classic American Guitar Show, and appeared at the prestigious Jazz Cafe, Smithsonian Institution, Washington DC.