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Re: TimeSignature with note in denominator

From: David Kastrup
Subject: Re: TimeSignature with note in denominator
Date: Sun, 14 Nov 2021 00:05:20 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Kieren MacMillan <> writes:

> Hi David,
>> It doesn't answer the question.
> Did my explicit answer in the other email (i.e., “one
> quintuplet-sixteenth-note”) not suffice?

No.  You propose replacing (cons 3 4) as a time signature designation
with (cons 3 (ly:make-duration 2)).  You have failed to give any
indication of what you want to see (cons 8 20) replaced with.

LilyPond does not have something like a 1/20th duration.  Regarding
durations, what occurs inside of \tuplet 5/4 and \tuplet 10/8 is
completely indistinguishable: "tupletism" is not a part of durations.

So I repeat: what duration in LilyPond do you want to use to represent
the denominator in 8/20 ?  1/20th here is neither a 5-tuplet nor a
10-tuplet: it represents a fraction of a whole note, not a particular of
several possible note values.

It will likely end up as (ly:make-duration 4 0 4/5) but that has no
unique printed representation different from (ly:make-duration 4), and
(ly:make-duration 4 0 4/5) and (ly:make-duration 4 0 8/10) are
absolutely indistinguishable.

David Kastrup

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