Weld the two climbing diminished moves into one staircase and you have gospel's signature run-up: the bass walks 1 → ♯1 → 2, breathes, then 4 → ♯4 → 5 and lands home. Every chord between the rungs is diatonic; every rung is a °7 leaning upward. Doo-wop turnarounds, shout music, and a thousand soul intros are this ladder at different speeds — learn it once ascending and you'll start hearing the floors go by.