Irish bouzouki Dónal Lunny, who replaced the octave strings on the two lower G and D courses with unison strings, thus reinforcing their lower frequencies. Soon after, on a visit with Irvine to the workshop of luthier Peter Abnett, Lunny commissioned a bouzouki to the specifications of a classic, 4-course Greek bouzouki but with unison strings and a three-piece, partially staved back. Since then, the instrument has been adapted for Irish traditional and other styles of folk music. The original Greek bouzouki was a three course/six-string instrument ("trichordo"). In the 1950s, a four course/eight-string ("tetrachordo") version was developed. The newer "tetrachordo" bouzouki
Irish bouzouki De Dannan, obtained a "trichordo" Greek bouzouki on his own. With a few exceptions, bouzouki players playing Irish music tend to use the instrument less for virtuoso melodic work and more for the chordal or contrapuntal accompaniment of melodies played on other instruments, such as the flute or fiddle. Because of this, it is common to use matched strings on the two bass courses, tuning to unison pairs in order to enhance the bass response of the instrument. Almost immediately after the Greek bouzouki's initial introduction, new designs built specifically for Irish traditional music were developed. The body was widened