> (disclaimer: working from memory -- check my work)
>
> 4 6
> - + -
> 8 8
>
> Gould allows the above time signature to describe one measure or
> two.
Yes, but AFAIK, from LilyPond's point of view, this gets handled as a
single measure – if you want a bar line within these 10 eighths, you
have to add it manually.
> In the case of one measure, she recommends beaming the 4/8 and 6/8
> sections of that measure as 4/8 and 6/8 would be beamed
> individually. For 6/8, that would usually be 3+3, not a single group
> of 6.
Yes.
> 4 + 6
> -----
> 8
>
> I didn't see Gould saying much about the above other than to
> discourage it. From the context, my impression was that treating it
> as two measures was not in the picture. If that impression is
> correct, I would count that as a difference.
I don't get this impression. And even if I'm wrong, it shouldn't
matter: as mentioned previously, from LilyPond's point of view, we
again have 10 eighths in a measure that should be divided in exactly
the same way as above.
> Everything else I know about this I learned from LilyPond, which beams
> it as a single group of 6. That is another difference.
IMHO such a difference shouldn't exist for the default settings: if we
have a compound setting x + y, then the beam patterns for x + y should
be identical to the patterns of x and y concatenated.
Werner