The Dorian Scale
The minor scale of jazz: from D to D on the white notes. It fits minor 7th chords like Dm7. The B natural gives it its cool, open colour.
35
Notation
Valves
D · 1+3
Beat by beat · Dm7
96bpm
60160
Piano sound: Salamander Grand Piano V3 — Alexander Holm, CC BY 3.0
Trumpet sound: University of Iowa Electronic Music Studios