meterSigGrp #1268
Comments
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That’s what meterSigGrp is for.
https://music-encoding.org/guidelines/v4/elements/metersiggrp.html
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Dr. Klaus Rettinghaus
> Am 19.01.2020 um 05:47 schrieb Craig Stuart Sapp ***@***.***>:
Somewhat related to issue #554, it would be useful to have "double" time signatures that indicate an alternating meter every other measure.
An exemplar would be from Benjamin Britten's War Requium (mvmt. 6):
The duration of the measures alternates between 2/2 and 3/2 meters.
A related example would be Debussy preludes, book I, prelude X:
In this example the meaning is almost the same as the first example, except that it is hard to distinguish between the two meters since they have the same written durations. But note the equals sign which is even more similar to issue #554
For the first example, I am wondering if repeating the <meterSig> element with the two time signatures is a good method of encoding (although it is no purely semantic):
<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="https://music-encoding.org/schema/4.0.0/mei-all.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
<?xml-model href="https://music-encoding.org/schema/4.0.0/mei-all.rng" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<mei xmlns="http://www.music-encoding.org/ns/mei" meiversion="4.0.0">
<meiHead>
<fileDesc>
<titleStmt>
<title />
</titleStmt>
<pubStmt />
</fileDesc>
<encodingDesc>
<appInfo>
<application isodate="2020-01-18T20:33:06" version="2.4.0-dev-56dda9d-dirty">
<name>Verovio</name>
<p>Transcoded from Humdrum</p>
</application>
</appInfo>
</encodingDesc>
<workList>
<work>
<title />
</work>
</workList>
</meiHead>
<music>
<body>
<mdiv xml:id="mdiv-0000001828529541">
<score xml:id="score-0000000741013182">
<scoreDef xml:id="scoredef-0000001434788564" midi.bpm="400">
<staffGrp xml:id="staffgrp-0000002083486214">
<staffDef xml:id="staffdef-0000000317997379" n="1" lines="5">
<clef xml:id="clef-0000000057078570" shape="G" line="2" />
<keySig xml:id="keysig-L3F1" sig="3s" />
<meterSig xml:id="metersig-L2F1" count="2" unit="2" />
<meterSig xml:id="metersig-L2F1b" count="3" unit="2" />
</staffDef>
</staffGrp>
</scoreDef>
<section xml:id="section-L1F1">
<measure xml:id="measure-L1" n="0">
<staff xml:id="staff-0000000720293967" n="1">
<layer xml:id="layer-L1F1N1" n="1">
<note xml:id="note-L5F1" dur="1" oct="4" pname="a" accid.ges="n" />
</layer>
</staff>
</measure>
</section>
</score>
</mdiv>
</body>
</music>
</mei>
The second meterSig is currently ignored in verovio rendering:
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Yes, that is what is needed. In this case it is an "alternating" pair of time signatures (for the first example). Is there a way indicating the "=" sign for the Debussy example (which is an "interchanging" example). In both cases for analysis (and performance of the Debussy), it would be useful to have an "invisible" time signature in each measure that describes the meter for that measure. Current rendering:
<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="https://music-encoding.org/schema/4.0.0/mei-all.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
<?xml-model href="https://music-encoding.org/schema/4.0.0/mei-all.rng" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<mei xmlns="http://www.music-encoding.org/ns/mei" meiversion="4.0.0">
<meiHead>
<fileDesc>
<titleStmt>
<title />
</titleStmt>
<pubStmt />
</fileDesc>
<encodingDesc>
<appInfo>
<application isodate="2020-01-18T20:33:06" version="2.4.0-dev-56dda9d-dirty">
<name>Verovio</name>
<p>Transcoded from Humdrum</p>
</application>
</appInfo>
</encodingDesc>
<workList>
<work>
<title />
</work>
</workList>
</meiHead>
<music>
<body>
<mdiv xml:id="mdiv-0000001828529541">
<score xml:id="score-0000000741013182">
<scoreDef xml:id="scoredef-0000001434788564" midi.bpm="400">
<staffGrp xml:id="staffgrp-0000002083486214">
<staffDef xml:id="staffdef-0000000317997379" n="1" lines="5">
<clef xml:id="clef-0000000057078570" shape="G" line="2" />
<keySig xml:id="keysig-L3F1" sig="3s" />
<meterSigGrp>
<meterSig xml:id="metersig-L2F1" count="2" unit="2" />
<meterSig xml:id="metersig-L2F1b" count="3" unit="2" />
</meterSigGrp>
</staffDef>
</staffGrp>
</scoreDef>
<section xml:id="section-L1F1">
<measure xml:id="measure-L1" n="0">
<staff xml:id="staff-0000000720293967" n="1">
<layer xml:id="layer-L1F1N1" n="1">
<note xml:id="note-L5F1" dur="1" oct="4" pname="a" accid.ges="n" />
</layer>
</staff>
</measure>
</section>
</score>
</mdiv>
</body>
</music>
</mei> |
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Related to this is: how to deal with timestamp units when there is a meterSigGroup? In other words, suppose that the meterSigGroup has two time signatures with different
In this case the 6/4 has However, if it were important to preserve the time signatures within the timestamps, this seems to be a problem, or at least an unnecessary complication because the timestamps have context-dependent units. Here is a demonstration of the changeability of the timestamps:
The <measure n="1">
<staff n="1">
<layer n="1">
<note dur="4" oct="4" pname="c" />
<note dur="4" oct="4" pname="d" />
<note dur="4" oct="4" pname="e" />
<note dur="4" oct="4" pname="f" />
</layer>
</staff>
<fermata staff="1" tstamp="1" />
<fermata staff="1" tstamp="2" />
<fermata staff="1" tstamp="3" />
<fermata staff="1" tstamp="4" />
</measure>
The timestamp units are now "8", so the values for the fermatas must be doubled: <measure n="1">
<staff n="1">
<layer n="1">
<note dur="4" oct="4" pname="c" />
<note dur="4" oct="4" pname="d" />
<note dur="4" oct="4" pname="e" />
<note dur="4" oct="4" pname="f" />
</layer>
</staff>
<fermata staff="1" tstamp="1" />
<fermata staff="1" tstamp="3" />
<fermata staff="1" tstamp="5" />
<fermata staff="1" tstamp="7" />
</measure> A problem will occur if you change the time signature, but do not update the timestamps in the music: Switching from 8/8 to 4/4 without adjusting the fermata timestamps:
Switching from 4/4 to 8/8 without adjusting the fermata timestamps:
(I encode with There is a discussion about this for future enhancement of MEI in such cases: music-encoding/music-encoding#322 |
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implemented with #2271 |
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Yes, I think we can close it. The MEI clarification was essentially about the timestamps, but we can leave this for later to be discussed in the MEI repo |
Somewhat related to issue #554, it would be useful to have "double" time signatures that indicate an alternating meter every other measure.
An exemplar would be from Benjamin Britten's War Requium (mvmt. 6):
The duration of the measures alternates between 2/2 and 3/2 meters.
A related example would be Debussy preludes, book I, prelude X:
In this example the meaning is almost the same as the first example, except that it is hard to distinguish between the two meters since they have the same written durations. But note the equals sign which is even more similar to issue #554
For the first example, I am wondering if repeating the
<meterSig>element with the two time signatures is a good method of encoding (although it is no purely semantic):The second meterSig is currently ignored in verovio rendering:
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