I know that D- is just another way of writing Dm and that Δ refers to a major chord. But what the heck is D-Δ, when you follow the - with the Δ in the same chord symbol? Could you spell out the chord tones? D, F, A....????
This Chord is the second one played in Duke Ellington's "In a Sentimental Mood."
This Chord is the second one played in Duke Ellington's "In a Sentimental Mood."

