Re: Chords with unequal durations

[Carl Sorensen]

On 9/13/10 11:16 AM, "Trevor Daniels" <address@hidden> wrote:

> 
> 
> Neil Puttock wrote Monday, September 13, 2010 4:48 PM
> 
>> That's an illegal merge, since it obscures the duration of the
>> minim.
> 
>>  In Nick's example, setting
>> 'ignore-collision allows the noteheads to be stuck on top of each
>> other with no regard for the individual durations: hence the
>> quaver
>> obscures the minim.  This means the merge commands are irrelevant,
>> since the merging code never gets called.
> 
> Just to avoid confusion, let's state this clearly.  Nick's original
> example showed a minim (half-note) being merged with a quaver
> (eighth-note).  That is allowed, as both durations are clear (in
> fact
> there's an example of this in LM 4.5.3 Real music example.)  No
> need to use 'ignore-collision, as this produces no error messages.
> 
> Merging a crotchet (quarter-note) with a quaver is also fine, no
> error
> messages.
> 
> But merging a minim (half-note) with a crotchet (quarter-note) is
> not
> allowed, and LilyPond will not do it, as it would not be possible to
> tell the duration of one or other of the notes, whether the note
> head
> were open or filled in.  It would be incorrect typesetting to force
> this
> with 'ignore-collision.

What does 'merge-differently-headed mean, then?

Carl