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Is there a name for the chord 1-2-4?
For instance, it's appearing in Schubert's Sonata D959 in the second bar: A-B-D.
The measure in question:
B minor 7th. It's lacking the 5th (F♯), but that's okay, the 5th doesn't add much color. If you add it in to the right hand, you'll notice that it doesn't change the sound much.
Required, but never shown