Music: Practice & Theory Stack Exchange is a question and answer site for musicians, students, and enthusiasts. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

For example, what does the △ mean in C△7?

share|improve this question
Be careful with using CM for C major. In Inkpen, a popular font with users of the Sibelius score-publishing program, lower-case letters are merely small versions of upper-case ones, so CM could easily be confused with Cm. Use Cmaj7 or C^. – Laurence Payne Feb 4 '15 at 20:11
Also have a look at this question and its answers. There the origin of the triangle (= triad!) is explained. – Matt L. Feb 4 '15 at 21:33
up vote 21 down vote accepted

It's a major 7th! C△7 would be C, E, G, and B♮.

share|improve this answer
Does that mean that it is the same as CM7? – Sam Jul 9 '12 at 13:54
Yes, it has the same meaning as a M or maj. – American Luke Jul 9 '12 at 14:04
There is muddy-ness in practice when it comes to using the △ alone. I have seen scores (I mean fake-books) where C△ = CMajor7 (as played on the recording), and other times where they clearly wanted only CMajor (perhaps the 7th ends up clashing with the melody). Perhaps this can be attributed by errors in transcription. Perhaps the answer is that they intended only CMajor and sometimes the CMajor7 will also work. – amalgamate Feb 4 '15 at 20:21

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.