Mensural Time Signatures

[ahankinson]

The only mensural time signatures that are "unique" to mensural notation is the o (including o. and o/, o./). All other time signature values can be shared between them.

The proposal is related to #73 but altered to allow for flexible encoding of things like these images:

music-encoding/music-encoding#504 (comment)

Which is to say that only the o values are not allowed in CMN; every other possible combination of numbers and letters, eg., c/, c3, c3/2 etc. would be allowed.

[BaMikusi]

@ahankinson Sorry, I read this thrice, but it's still beyond me -- perhaps some typos therein?

[lpugin]

A quick estimate shows that we have about 500 non mensural incipits using o sign. We can evaluate if it makes sense to change them to mensural, but I am not sure we will be able to do so for all of them - if any.

This means we probably want to allow o in CMN but have the specs saying it SHOULD NOT be used.

[BaMikusi]

OK, that makes more sense (the present situation and the wished-for future appeared somehow conflated here, to my mind resulting in seeming contradictions).

I shall ask Carlo for a list of the CWMN o cases -- perhaps there is a pattern behind the phenomenon (with respect to libraries, or even catalogers) that could allow for a relatively easy fix.

[ahankinson]

Sorry -- I was trying to write the issue and clarify it in person at the same time. I've updated it to what I think I meant?