Hi Dave,

I've come across this a few times over the years and sometimes it's been minor, sometimes diminished and sometimes half-diminished. These days, I look at the notes and work out what the arranger is wanting.

http://tamingthesaxophone.com/jazz-chord-symbols.html

The above link might help. I notice in this link, it's a minor-major-7th chord (e.g. CmM7).

Hope this helps,
Noel


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