Irish bouzouki Johnny Moynihan (apparently in an attempt to replicate the open, droning sound of Appalachian "clawhammer" banjo) first on the mandolin and then transferred to a Greek bouzouki. It was later picked up by Andy Irvine and Dónal Lunny, and quickly became the next thing to a standard tuning for the 4 course instrument. Other tunings used, although by a minority of players, are "octave mandolin" tuning G2 D3 A3 E4, and "Open D" tuning A2 D3 A3 D4. "Open G" G2 D3 G3 D4, is used by some players and has proven useful for "bottleneck" slide playing. The GDAD tuning
Irish traditional music form of improvised "countermelody" is often used in the accompaniments of bouzouki and guitar players. In contrast to many kinds of western folk music, there are no set chord progressions to tunes; many accompanyists use power chords to let the melody define the tonality or use partial chords in combination with ringing drone strings to emphasize the tonal center. Many guitarists use DADGAD tuning because it offers flexibility in using these approaches, as does the GDAD tuning for bouzouki. Like all traditional music, Irish folk music has changed slowly. Most folk songs are less than 200 years old. One measure