The sound of rezophonic or resonated guitar-DOBRO is characteristic for country music, Hawaiian music, blues, and old-time jazz music. It was regarded as an American folk instrument, even though its inventor John Dopyera (1893-1988) was a native Slovak. He was born in Strafe and lived his childhood in Dolná Krupa near Trnava, from where he and his family emigrated to California in 1908. Dopyera and his brothers opened a music shop in Los Angeles, repairing and producing musical instruments. He made the first application for an American patent for the construction of his special rezophonic guitar in 1926, which he later...