songwriting Intervals scales&modes
In music theory, an interval is the difference between two pitches. An interval may be described as horizontal, linear, or melodic if it refers to successively sounding tones, such as two adjacent pitches in a melody, and vertical or harmonic if it pertains to simultaneously sounding tones, such as in a chord Interval (music) – Wikipedia
fretboard interval shapes part 3
modes-“scales within a scale”.
compare modes by playing modes beginning from same note d-dorian d-Phrygian
play modes against chord backing track or drone root note