The Music Stem / The Musician's Library / Composer's Handbook / Guide-Tone Line
Composer's Handbook
A guide-tone line connects the thirds and sevenths of a progression.
Connect the thirds and sevenths of Dm7–G7–Cmaj7 smoothly.
F–F–E (3rd, 7th, 3rd) or C–B–B (7th, 3rd, 7th).