Bouzouki heavy mother-of-pearl ornamentation often seen on modern bouzoukia is typical of bouzoukia of the period. It has tuners for eight strings, but has only six strings, the neck being too narrow for eight. The luthiers of the time often used sets of four tuners on trichordo instruments, as these were more easily available, being also used on mandolins. This type of bouzouki has 8 metal strings, which are arranged in 4 pairs, known as courses, typically tuned CC–FF–AA–DD (i.e., one whole step below the four high strings of a guitar). In the two higher-pitched (treble) courses, the two strings of
Bouzouki better suited to the kind of virtuoso playing he was famous for. Today, the tetrachordo is the most common bouzouki used in Greek music, though a few traditionalists still prefer the trichordo, particularly for the older "rebetika" style of playing. In addition to developing the modern tetrachordo bouzouki, Manolis Hiotis was a pioneer the use of amplification for the instrument, which he may have been using as early as 1945. However, the earliest documented use of amplification for the bouzouki comes from a 1952 photograph, showing Vasilis Tsitsanis and Yiannis Papaioannou playing bouzoukis, each with an electric guitar-style pick-up attached