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
Vangelis Trigas "12 Organika Yia Trihordo Bouzouki(12 instrumentals for the three string bouzouki)" and "Se 3 Horthes (On three Strings)". The third one contains remakes of old popular songs entitled, "Aftoschethiasmi Ke Tragouthia Yia Bouzouki(improvisations and songs for the bouzouki)". He has also participated in several albums such as, "Otan Simvi Sta Parix(when it will happen at the Perix)" by George Dalaras, recorded in 2007 at the Odeon of Herodes Atticus, "San Tragoudi magemeno(like an enchanted song)" by George Dalaras, recorded in 2008 at the Concert Hall, "Afstiros Laikon(strictly folk)" by Manolis Lidakis, recorded in 2006, etc. Personal discography: His participations: He