Interactive dark-mode C Major Single-Orbit MTT study for the seven diatonic tertian triads. Every selected pitch class activates its exact pitch circle, central scale-degree oval and root, all seven corresponding rainbow routes, and the matching pitch class, absolute scale degree, and relative scale degree in every exterior mode row. Exterior rainbows stop at the heptagon and the active exterior ovals are individually fitted to their three authored labels. The accepted scale-degree weight rules and all structural layer protections remain unchanged. 1 2 3 5 6 4 7 1 2 3 4 5 6 7 I vii° vi V IV iii ii 7 1 2 3 4 5 6 (1) (2) (3) (4) (5) (6) (7) L O C R I A N 6 7 1 2 3 4 5 (1) (2) (3) (4) (5) (6) (7) N A I L O E A 5 6 7 1 2 3 4 (1) (2) (3) (4) (5) (6) (7) N A I D Y L O X I M 4 5 6 7 1 2 3 (1) (2) (3) (4) (5) (6) (7) N A I D Y L 3 4 5 6 7 1 2 (1) (2) (3) (4) (5) (6) (7) P H R Y G I A N 2 3 4 5 6 7 1 (2) (1) (3) (4) (5) (6) (7) D O R I A N 1 2 3 4 5 6 7 (1) (2) (3) (4) (5) (6) (7) IONIAN 1 2 3 4 5 6 7 IONIAN 1 2 3 4 5 6 7 D O R I A N 1 2 3 4 5 6 7 P H R Y G I A N 1 2 3 4 5 6 7 N A I D Y L 1 2 3 4 5 6 7 N A I D Y L O X I M 1 2 3 4 5 6 7 N A I L O E A 1 2 3 4 5 6 7 L O C R I A N