The bouzouki arrived in Greece following the 1919–1922 war in Asia Minor and the subsequent population exchange between Greece and Turkey. The early bouzoukia mostly had three courses (six strings in three pairs, known as trichordo) and were tuned in different ways, according to the scale one wanted to play. At the end of the 1950s, four-course (tetrachordo) bouzouki 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; this angered purists, but allowed for greater virtuosity and helped elevate the bouzouki into a truly popular instrument capable of a wide range of musical expression. Recently the three-course bouzouki has gained in popularity. The first recording with the four-course instrument was made in 1956.