THE 4-COURSES AND 3-COURSES BOUZOUKI TUNING OF THE 6-STRING GUITAR AND OUD
This is a tuning of the guitar where the lower 4 strings are as in a 4-courses Greek Bouzouki in other words C2-F2-A2-D3 and the higher 3 as in a 3-courses bouzouki in other words D3-A3-D4 . In total C2-F2-A2-D3-A3-D4. It is an open Dm7 tuning
Similarly for If the guitar is child's guitar of scale length 55-58.5 cm then the previous tuning can be raised to the (with standard guitar strings)
This is also applicable to the 6-courses oud too.