No time signature after section break

• Nov 26, 2018 - 12:41
Reported version
P1 - High
S3 - Major

After a section break there should be a time signature

Attachment Size
no-clef-after-section-break.mscz 2.55 KB


Workaround No Yes

Workaround - just add it again. Actually, I'm not even 100% sure this isn't by design - I think the main purpose was to suppress courtesy signatures, not to force new ones. ut I agree it seems to make sense. Might be some people depending on current behavior, though?

In 2.x I often found behavior around sections breaks depended on the order I did them (add key change then add section break vs vice versa). But at least if I do add a time signature after adding the section break, I don't get a courtesy (true for both 2.3.2 and 3.0).

I'm more than happy to see this fixed, but given how long it's been the case and how easy the workaround is, maybe it's not as critical as some others...

If you add a timesig all following measures are reset to the timesig. This will destroy upbeats as well as modified measure lengths.

Maybe the XML import set this additional timesigs in MS2? I cannot remember this as issue there.

Priority P0 - Critical P1 - High

True, Still, one would normally be doing this before adding content to those measures. Anyhow, given this is same as 2.3.2 and some people might actually depend on this, I'm personally uncomfortable with a rush decision on fixing.

True, but I'm not understanding your point. Are you saying MusicXML is somehow relevant here? You have a sample MusicXML file that contains an element we are interpreting as a section break but not using the same semantics as defined in the spec?

Lets take this reduced example:

  1. Export as pdf
  2. Scan in Capella and save as musicxml (attached)
  3. Import in MuseScore. Please try to insert the missing time signature at the start of the song...
    If you a) insert the time signature, all measures are reset to 4 / 4 which is a real mess.
    If you b) insert a section break at the end of the intro (which is correct anyway, to avoid courtesy clefs, keys or timesigs) it does not insert the timesig.

I see, so inserting the 4/4 at the beginning of the "Song" eliminates the pickup. So, first insert on the first full measure, thus "protecting" the content from there, then add it to the first measure, then correct the actual duration, then delete the extra time signature. Convulted yes, but anyhow, that's how to deal with this particular corner case in both 2.x and 3.0 for now.

Sorry, but your suggestion does not work. Did you really try that? If I insert the 4/4 at the first full measure, the shortened measures in the voltas get corrupted as well as the subsequent pickup measure thereafter.

And no, this is not a corner case. Many songs have such a structure.

Yes, I did try the suggestion, I just didn't look far enough ahead to see that there were problems further down.

There are several respects in which the scenario you describe is a corner. One is that what you are trying to do is actually incorrect notation - it's not normally correct to repeat the time signature after the intro to a song. Not sure why you're trying to do that, but the standard is not to. Only if it's a different song. And in that case, you almost certainly would not be importing both songs from a single MusicXML file, as that isn't really supported to begin with.

In normal use, section breaks would be added as you enter your music, left to right, start to finish, so there would be no issue simply adding the time signature then, before you've entered notes or done any other customization to the measures that follow.

Anyhow, I'm agreeing it would be worth revisiting the original intent of section breaks and consider extending the behavior to support the ability to display time signatures. That's why I didn't simply close this as "by design" even though it technically is. But if we do extend the behavior, it would be important to do so in a way that doesn't break compatibility for people relying on the current behavior - eg, people using section breaks as separators within worksheets and other situations where repeating the time signature is not desired.

I think the best way forward is to add a new property to the section break to control whether you want to generate time signatures or not, much as we already have properties to control the length of the playback pause, whether you want measure numbers to reset, and whether you want long instrument names to be used. This could be done in conjunction with moving these properties form the dialog where they are now to the Inspector. I think ideally the default for newly-added section breaks should be to have the time signature option on, but for compatibility, scores that don't have this set explicitly should continue to have it off. This could be done by having the actual property default to off but having it explicitly set to on in the palette.

While my PR solved my own issue with my current project it does not seams to be a generic solution.

  1. If there is no time signature in the first measure of the first movement - does it really make sense to generate one at the start of the second movement? Even though I updated my PR to display the time signature only when there is a time signature in the first measure of the score, what is if there are three movements and only the second has a local time signature..?

  2. Maybe a setting in Style > Page > "Create time signature after section break" whould be a generic solution?

  3. In MS2 after a MusicXML import, behind a section break a time signature got inserted and displayed. This is not the case in MS3 anymore. Is the real issue the missing time signature in the MusicXML import? But at the other hand there is this similar request in #284848 which does not seams to be related to MusicXML.

Any opinions?

I don't have strong feelings. I am uneasy about changing behavior that has worked a given way for years with few complaints, and adding the new time signature manually is not difficult. But indeed, in the most common cases, you do want to see it, so if it's equally simple to remove the generated one in your PR, then it's fine with me in principle. Do you handle existing scores OK? That is, if they have a section break but the user did not choose to add a time signature, will they continue to look that way, or will the user be forced to remove it now? Is this the case both for scores imported from 2.x and for score created in 3.0?

In reply to by Marc Sabatella

  1. Existing scores will get a new time signatures. Thats the initial purpose of the fix.
  2. You cannot remove the time signature, because it will then be regenerated again. You have to make it invisible.
  3. There is no difference in MS2, MS3 or MusicXML files.

Because of your points, I suggested the new setting which would keep the existing behaviour if not checked.

I do not share your opinion regarding the simplicity of the insertion of a new time signature. As demonstrated above, when you add a time signature it will reset any following measures with deviating length. This is not manageable in existing scores. At the other hand, would it be a possible fix if there is a special mode of inserting a time signature which makes no changes to any measure length but just insert the signature?

I'm not sure why you would have so many existing scores that are missing these time signatures - again, in normal usage they have been added when you added the section breaks? I mentioned that above and am still not completely understanding how you got yourself into this mess. Something having to do with MusicXML import I guess? Maybe it makes more sense to take a step back and see if there isn't something that could be done at that level?

Anyhow, it's a deal breaker if time signatures after section breaks can't be controlled individually. Hiding them leaves the space behind, and a style setting is all-or-nothing. There needs to be a way to specify this per section break, maybe in the section break properties.

In reply to by Marc Sabatella

Yes, my problem originates from MusicXML import. And I agree (and have already suggested) that it should (also) be fixed there. But leave that aside and let just imagine a single score in which the time signature is missing because it slipped through. You simply can not enter it if your score contains shorted or extended measures as for example a repeat and subsequent upbeat. This will destroy the structure of the score. And that does not neccessarily must be behind a section break. Hence the "insert mode" suggestion.

Btw, you can set a negative Leading space to avoid the space of a hidden element.

Finally: A section break property is a better idea then a global option. Thank you!

My point is that in normal use, you won't have anything after this point that would be messed up, because the normal use would be to enter this before entering the other stuff. So it's really an extremely rare use case where this is a problem. That's why it is absolutely crucial not to break the common things people do today that work well. I think existing scores need to not be affected by default, but it should be easy to take advantage of the new capability - like, selecting all section breaks and then applying the proposed new setting manually. This is probably also the time, then, to move section break properties to the Inspector, which will facilitate that as well as improve general usability.

So, to summarize:

  • section breaks should have a property to control the appearance of timesigs after
  • existing scores with section breaks should have this off for compatibility
  • it should be easy to select section breaks and turn them on via the Inspector
  • newly added section breaks should behave the same whether added to old or new scores
  • I don't care which way these newly added breaks go, sounds like there is some consensus for setting the new property to "on"