I became sort of interested in a certain musical chord, which has an unusual “haunting” quality, when I was a kid. We had a player piano, and you could visualize chords as they scrolled by as punched holes in a paper roll. Every so often, especially in classical pieces, there would be a four-note chord where the bottom end of it would consist of two notes right next to each other - meaning a half tone apart - such as this: D-D#-G-D (the second D being an octave up from the first).
It sort of baffled me, because I thought playing two notes a half-step apart would make something dissonant and harsh, but this chord had a very pretty, haunting quality wherever it would pop up. (I liked it so much that I started adding it to piano rolls with a razor blade, which didn’t always work so well, but at least I was willing to experiment.)
I’ve been trying to find a name for this chord and its variations up and down the scale; unfortunately being unschooled in music theory I can’t quite nail it. Searching online, Wikipedia tells me there’s the Minor Major Seventh, sometimes called the Hitchcock chord because Bernard Hermann liked to use it in Hitchcock film scores. It’s similar, but is shown in a different configuration, say D#-G-B-D - note that the “dissonant” part in this version is separated by a near-octave, and they throw a B in there, which does add a mysterious quality to it. But that’s not my chord. Mine is not exactly mysterious, just sort of evocative and nostalgia-inducing and somehow sounds right, not dissonant at all when you hear it as part of a piece, which I think is sort of a miracle.
So please, could someone help the idiot name this chord? Maybe explain how it works or who has made good use of it? Thanks in advance.