Bouzouki Asia Minor and the subsequent exchange of populations between Greece and Turkey when the ethnic Greeks fled to Greece. The early bouzoukia were mostly three-string ("trichordo"), with three courses (six strings in three pairs) and were tuned in different ways, as to the scale one wanted to play. At the end of the 1950s, four-course (tetrachordo) bouzoukia started to gain popularity. The four-course bouzouki was made popular by Manolis Chiotis, who also used a tuning akin to standard guitar tuning, which made it easier for guitarists to play bouzouki, even as it angered purists. However it allowed for greater virtuosity
Irish bouzouki and a flat back with straight sides replaced the round, stave-built back of the Greek bouzouki. English builder Peter Abnett, who was the first instrument-maker to build a uniquely "Irish" bouzouki – for Dónal Lunny in 1970 – developed a hybrid design with a 3-piece partially staved back and straight sides. All of the initial Irish bouzoukis had flat tops, but within a few years a few luthiers such as Stefan Sobell began experimenting with carved, arched tops, taking their cue from American archtop guitars and mandolins. Even so, today the overwhelming majority of builders continue to opt for flat