This is an open Am7 tuning e.g, for a children 54 cm scale length guitar.
It is 3-curses bouzouki C2-G2-C3 , a 3-courses panduri (inverted A minor) C3-A3-E4 and a 3-courses bouzouki A3-E4-A4 in total
C2-G2-C3-A3-E4-A4 which is also an inverted form of the Am7 chord.
It could also be
F#2-C#2-F#3-A3-E4-A4
an open F#m7
For the oud one tone lower is more appropriate
B1-F2-Bb3-G3-D4-G4 which is also an inverted form of the Am7 chord.
D2-A2-D3-G3-D4-G4
And of course it can be a major chord too if the distance of the two power chords is a major interval of 3 E.g.
F2-C2-F3-A3-E4-A4 which is an open F major 7
For the oud one tone lower is more appropriate
Eb2-Bb2-Eb3-G3-D4-G4 which is an open Eb major 7
For standard 66 cm scale length guitar it can be e.g.
D2-A2-D3-F3-C3-F4 which is an open Dm7 or
C2-G2-C3-E3-B3-E4
which is an open C major 7
THE LATER TUNINGS ALLOWS TO PLAY IN MELODIES THE PARTS OF THE MELODIC THEMES OF INTERVALS OF 2 OR 3 HORIZONTALLY WHILE SΗIFT THE MELODIC THEME BY INTERVALS OF 4, 5 OR 8 VERTICALLY (FOR MELODIC THEMES MUTATIONS). IN TOTAL I FIND THIS TUNING VERY CONVENIENT FOR MELODIES IMPROVISATION.
It is 3-curses bouzouki C2-G2-C3 , a 3-courses panduri (inverted A minor) C3-A3-E4 and a 3-courses bouzouki A3-E4-A4 in total
C2-G2-C3-A3-E4-A4 which is also an inverted form of the Am7 chord.
It could also be
F#2-C#2-F#3-A3-E4-A4
an open F#m7
For the oud one tone lower is more appropriate
B1-F2-Bb3-G3-D4-G4 which is also an inverted form of the Am7 chord.
D2-A2-D3-G3-D4-G4
And of course it can be a major chord too if the distance of the two power chords is a major interval of 3 E.g.
F2-C2-F3-A3-E4-A4 which is an open F major 7
For the oud one tone lower is more appropriate
Eb2-Bb2-Eb3-G3-D4-G4 which is an open Eb major 7
For standard 66 cm scale length guitar it can be e.g.
D2-A2-D3-F3-C3-F4 which is an open Dm7 or
C2-G2-C3-E3-B3-E4
which is an open C major 7
THE LATER TUNINGS ALLOWS TO PLAY IN MELODIES THE PARTS OF THE MELODIC THEMES OF INTERVALS OF 2 OR 3 HORIZONTALLY WHILE SΗIFT THE MELODIC THEME BY INTERVALS OF 4, 5 OR 8 VERTICALLY (FOR MELODIC THEMES MUTATIONS). IN TOTAL I FIND THIS TUNING VERY CONVENIENT FOR MELODIES IMPROVISATION.