Crossroad Tuning System
A5 is "the naked Blue Note", is not suspended IV.
Define :
∆ ≡ ( Pythagorean Comma ) ^ ( 1/6 )
2 × ∆ ≡ d ^ 307
d = 1.002267733
Nut 81.7348897 109.2263233 145.9644681 195.0594445 245.9445862 328.6677573 E2 A3 D3 G3 B4 E4 86.4970306 115.5902046 154.4688334 206.4242431 260.2741188 347.8170113 1 Fret 86.5950511 115.7211942 154.6438812 206.6581680 260.5690678 348.2111659 F2 C4 F4 86.6931827 115.8523323 154.8191274 206.8923580 260.8643509 348.6057673 2 Fret 91.7442099 112.6022665 163.8393940 218.9465807 276.0631576 368.9166746 B3 E3 A4 97.0895263 129.7454738 173.3852107 231.7031215 292.1474963 390.4109616 3 Fret 97.1995505 129.8925045 173.5816950 231.9656931 292.4785649 390.8533848 G2 C3 F3 D4 G4 97.3096994 130.0397019 173.7784020 232.2285622 292.8100087 391.2963093 4 Fret 414.0945066 B4 328.4196887 5 Fret 438.8832631 A3 D3 G3 C4 E4 A5 439.1318693 A5⤴cho 447.6969614
A5 is "The Naked Blue Note",and Is not "Suspended IV.
"The Naked Blue Note" is not only A5. For example, D4, E4, G4 are "The Naked Blue Notes".
"The Naked Blue Note" is Pythagorean Integer.
D4 = [ 2048 / 7 ]
E4 = [ 2304 / 7 ]
G4 = [ 8192 / 21 ]
A5 = [ 3072 / 7 ]
"Major Pentatonic" ( Key : E ) is "Just Intonation".