The major 7th on the guitar
11 semitones · M7 · C → B
Its character, in the app's words: yearning; an octave wider (M14), near-arrival: the desire becomes extreme expectation.
The shapes on the neck
- On the same string: 11 frets up.
- On the next string, towards the 1st: 6 frets up; 7 frets up when you cross from the G string to the B string, which are tuned a major 3rd apart instead of a 4th.
- Turned upside down it becomes a minor 2nd: 11 + 1 = 12 semitones.
The root is the C on the A string, 3rd fret; the other circles are the same note, B, wherever it sits between frets 0 and 12. The 1st string (high e) is at the top, as in the app. The root is filled.
Open it in the app: 2. Intervals
The other intervals