Em Sáb 25 Set 2004 10:00, Remo D. escreveu:
> Reading the ABC draft 2.0 standard it's not clear to me what a
> meter like (2+4+2)/8 should be used.

Probably you've never needed it (Greek musicians should, though).  
This notation is used when there is need to emphasise how the parts 
of a bar are structured.  While we automatically split a 4/4 in two 
2-beat parts (so that you have a "strong" beat followed by a "weak" 
and a "semi-strong" and a "weak" one respectively), in a 5/4 you may 
have either e.g.

  (a) a 2-beat part followed by a 3-beat part, in the pattern
      strong + weak + semi-strong + weak + weak (i.e., a strong
      binary and a weak ternary), or
  (b) a 3-beat part followed by a 2-beat part, in the pattern
      strong + weak + weak + semi-strong + weak (i.e., a strong
      ternary followed by a weak binary)

The way you feel the "stress" on these parts is very important for 
dancers, for instance, and for ear-playing.

> And the parenthesis should be
> printed only for the numerator?

Why otherwise?  I can't see the point.  In typesetting, the x[+y...]+z 
numerator would simply come above the denominator (center-justified 
between themselves) or the parts would be written in full, side by 
side, as if they were a sequence of meters, e.g. (for a 7-beat meter 
with accents on the first, third and sixth beats respectively):

  2+3+2
    4

or

  2 3 2
  4 4 4

> And what about a tempo like Q:1/4 3/8 1/4 3/8=40?
>

From the ABC draft 2.0 standard:

   This means: play the tune as if Q:5/4=40 was written, but print the
   tempo indication using separate notes as specified by the user.

-- 
Paulo Tibúrcio
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