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 De Dannan, obtained a "trichordo" Greek bouzouki on his own. With a few exceptions, bouzouki players playing Irish music tend to use the instrument less for virtuoso melodic work and more for the chordal or contrapuntal accompaniment of melodies played on other instruments, such as the flute or fiddle. Because of this, it is common to use matched strings on the two bass courses, tuning to unison pairs in order to enhance the bass response of the instrument. Almost immediately after the Greek bouzouki's initial introduction, new designs built specifically for Irish traditional music were developed. The body was widened