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
Strings (band) led them to an appearance on the show's second-season finale, airing on Pakistan's Independence Day (14 August 2009), in which they performed ""Titliyan"". In November Strings released the ""Titliyan"" music video, which did well on local music charts. In June 2010 Strings signed a one-year partnership with Abu Dhabi-based Etihad Airways as its brand ambassadors, promoting Pakistan in the global market with the band’s music. Peter Baumgartner, chief commercial officer for Etihad Airways, said he was "looking forward to witnessing how the Etihad brand name reached across the world through the music of Strings." Vocalist Faisal Kapadia said, "It is