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 is closer to the D3A3D4 tuning of the Greek trichordo bouzouki than is the guitar-like tuning C3F3A3D4 used on the modern Greek tetrachordo, and is particularly well suited to a modal harmonic approach to accompaniment as used in Irish traditional music. Alec Finn, playing a Greek trichordo bouzouki, uses the traditional D3A3D4 tuning with the octave pair on the low D course changed to unison. Amongst many luthiers and musicians the Irish bouzouki is considered to be part of the mandolin family, but for others this new family of instruments is a separate development. In actuality, the mandolin and lute