What does a triangle mean in chord notation?
For example, what does the ? mean in C?7?
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It's a major 7th chord! C?7 would be C, E, G, and B?.
The triangle also shows up in a common notation for minor major seventh chords. For example, CmM7 can be written as C??. The underlined triangle seems to be a combination of the C? notation for Cm and the C? notation for CM7.
This seems especially common, along with C? instead of Cm7?5 for half-diminished chords, in hand-written charts. Less to write, and less information to process for improvisers reading the through the changes.
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