Diatonic 7th Chord Question

[stanron]

I thought I'd have a little hunt around to see where I had seen this before. The last time I saw it was in post 3 of this thread;

http://www.acousticguitarforum.com/f...d.php?t=355903

My first reaction was the same as yours but then I saw the difference between the GM6 and Em7. The idea does communicate although the M is somewhat redundant.

Perhaps Howard could point us to it's origins.

[Howard Klepper]

I've never named a dominant 7th chord with an M, or seen it done except by mistake.

It's redundant with the major 6th, but I added it to that post for clarity (and apparently achieved the opposite). The upper case letter M is always read as "major." The lower case m is always read as "minor."

[Laughingboy68]

Let's be perfectly clear. If you see M7, play bittersweet major seventh chord (major third major seventh); if you see plain ol' 7, play tangy, "I wanna resolve to the tonic", dominant seventh chord (major third, minor seventh).

Major seventh shorthand - maj7, M7, more rarely a triangle followed by 7

Minor seventh shorthand - min7, m7, more rarely -7

Dominant seventh shorthand: 7 or dom7

[SprintBob]

Originally Posted by Howard Klepper

You have the wrong chord spelling for the chord with its root on the fifth tone. It's a G7, not a GM7.

You are correct, typo on my part.