Irish bouzouki when having a longer scale length. The fifth course is usually either a lowest bass course tuned to C2 or D2 on an instrument with a long scale, or a highest treble course tuned to G4 or A4 on a shorter scale. Luthier Stefan Sobell, who coined the term "cittern" for his modern, mandolin-based instruments, originally used the term for short scale instruments irrespective of the number of their strings, but he now applies "cittern" to all 5 course instruments irrespective of scale length, and "octave mandolin" to all 4 course instruments, leaving out bouzouki entirely. Mandolin-family luthiers producing an
Bouzouki one piece. The top plays a major role in the sound because it resonates and strengthens and prolongs the vibration of the strings. Another factor that affects the quality of the sound is the varnish and the method of its application. The best varnish is a natural one made of shellac, which is applied by hand in many layers in the traditional way, for both acoustic and visual effect. The neck must be of very dry hardwood in order not to warp and increase the distance of the strings from the fret board (the action height) which makes playing the