8253 / 18210 · Workshop 66 — Melodic Development Through Guide Tones: Making 3rds and 7ths Sing, Connecting Chords Horizontally, and Building Lines That Explain the Harmony← prev⊞ allnext →
66.22Build line
Cmaj7: C perhaps melody.
A7: C♯.
Dm7: D or C/F depending line.
That semitone:
C→C♯→D
explains the secondary dominant beautifully.