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
Bouzouki bouzouki and the baglamas are the direct descendants. The Greek marble relief, known as the Mantineia Base (now exhibited at the National Archaeological Museum of Athens), dating from 330–320 BC, shows a muse playing a variant of the pandoura. From Byzantine times it was called pandura and then tambouras. On display in the National Historical Museum of Greece is the tambouras of a hero of the Greek revolution of 1821, General Makriyiannis. Other sizes have appeared and include the Greek instrument tzouras, an instrument smaller in size than standard bouzouki. The bouzouki arrived in Greece following the 1919–1922 war in