> -----Original Message-----
> From: David Kastrup [mailto:d...@gnu.org]
> Sent: Saturday, January 04, 2014 8:12 AM
> To: MING TSANG
> Cc: lilypond-user mailinglist
> Subject: Re: r on voice2
> 
> MING TSANG <tsan...@rogers.com> writes:
> 
> > \version "2.18.0"
> > \language "english"
> > <<{ f'2 r }\\{ r8 <c' a>4 q8 r <d' c' a>8[ r q8] }>> |%m20
> >
> > The above lily code r on voice two does not lineup. How can that be lineup
> properly?
> 
> \version "2.18.0"
> \language "english"
> <<{ f'2 g'\rest }\\{ b8\rest <c' a>4 q8 b8\rest <d' c' a>8[ b\rest q8] }>> 
> |%m20
> 
> But I am not convinced that this is an improvement.
> 
> --
> David Kastrup
> 

I happen to have a copy of the Gould book on hand at the moment, so FWIW, 
here's a couple things she says about rest placement in (as she calls it) 
double-stemmed writing.

First, "Semibreve and minim rests must never stray across the centre 
stave-line," accompanied by two examples that look like this:

\version "2.18.0"
<< { \numericTimeSignature \partial 2 b'2\rest |
     \override MultiMeasureRest.staff-position = 2 R1 | } \\
   { \partial 2 c'4 d'~ | d'2 c' } >>
<< { \numericTimeSignature \partial 2 f''~ | f''2 a''2 | } \\
   { \partial 2 g'2\rest | \override MultiMeasureRest.staff-position = 0 R1 | } 
>>

Second, "The space in which a rest centres, or its distance from the stave, 
should be on the same level as surrounding pitches."

Based on these two "rules," I think that Gould would essentially recommend 
David's version, except that the half rest in the upper voice should move up to 
the third line: 

<<{ f'2 b'\rest }\\{ b8\rest <c' a>4 q8 b8\rest <d' c' a>8[ b\rest q8] }>>

This looks pretty good to me, actually.

DR

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