The Dobro® resonator guitar, an american invented instrument, has been around since the mid 1920’s.Guitars of this type, built by independent guitar makers, are referred to as resonator, or, resophonic, guitars.the resonator guitar, now in a “Golden Era”, is popular in contemporary Bluegrass music, adding a soulfull, bluesy touch to the music. Modern country music has rediscovered the resonator guitar after abandoning the instrument for decades.