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My understanding is that a time signature like 4/4 time is known because certain beats are emphasized, for example: ONE, two, three, four. But let's say someone created a song with tempo alone (ie just used a metronome) and didn't emphasize any beats. Then can a song's time signature be simply unknown and cannot be categorized into 3/4, 4/4, 2/4 etc?

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    People have been doing this for a thousand years (literally!) already. Listen to some plainchant (Gregorian chant) on YouTube. It has a regular pulse, but no time signature. – user19146 Aug 1 '18 at 7:24
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    It's very common in rock music too. The most famous example is Master of Puppets, where the verse ends with a completely non-signatured phrase, somewhere between 5/8 and 6/8, but the missing roughly-32nd note is not by design - and that would be nigh on impossible to count anyway. – Juha Untinen Aug 1 '18 at 7:53
  • Try tapping your foot along to any Ozric Tentacles piece. I do it for fun sometimes... It's a bit like trying to pick up soap you've dropped in the bath.. – Richard Aug 2 '18 at 0:24
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    A propensity for pattern recognition is one of the things that makes us human, as is an opposing thumb- so handy when that soap gets away, @Richard. With or without time signatures, we'll always go hunting for patterns. ncbi.nlm.nih.gov/pmc/articles/PMC4141622 – Areel Xocha Aug 3 '18 at 23:23
  • @AreelXocha How funny that I got a notice for your message, even though it was for a different Richard! But yes: pattern recognition is a huge part of being a human and of being a musician! – Richard Aug 3 '18 at 23:33
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It can happen when the groupings of note change per measure and don't stress any exact metric pattern. While not common, it can happen and the most famous example of this is in the 3rd movement of Quartet for the End of Time.

enter image description here

As you can see the tempo is defined, but the meter is not. The eighth note gets the tempo markings, but it's not technically the beat because there is none. Listening to it should give you an idea how it flows. The most interesting thing to me is how the bar line is kept not because of the metric hierarchy, but to show accents in place of it.

  • Another example is Pan from Britten's Six Metamorphoses after Ovid: youtube.com/watch?v=hLxWE_7XiWk It's written without a time signature and the measure lines are used as phrase markings – Jacob Swanson Aug 1 '18 at 3:13
  • Some modern composers never use time signatures. Some don't even use bar lines to indicate meter. – user19146 Aug 1 '18 at 7:25
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Indeed, some songs' time signatures cannot be neatly categorized into 3/4, 4/4, 2/4, 9/8, 5/4, etc.

Songs in free time aren't notated with any time signatures at all. Satie was pretty fond of writing such pieces.

Songs in mixed meter are notated with time signatures, but they change time signatures as necessary (and sometimes pretty often). Perhaps covertly the most famous mixed-meter song is "The 12 Days of Christmas". Other mixed-meter songs that stick out in my mind include Stravinsky's "The Rite of Spring" and Dream Theater's "Ytse Jam".

  • I can't believe I never noticed the meter of The 12 Days of Christmas before! – The Chaz 2.0 Aug 1 '18 at 13:17
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Would you count music without even tempo? Lots of Penderecki has just minutes and seconds of elapsed time marked off. There's no meter or tempo. And there are lots of vertical dotted lines to show where the different changes in the music line up between instruments.

Also the theme to The Terminator is based on a loop that doesn't really fit in a time signature or meter.

  • Great point. Philosophical question: in Penderecki, is the BPM then 60? – Richard Aug 1 '18 at 16:48
  • @Richard I would say there are no beats in the first place, so there's no meaning to the idea of "beats per minute". Another way to look at it is BPM would be 0. – Todd Wilcox Aug 1 '18 at 16:51
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One genre where a time signature is completely alien is plainchant:

Sanctus from Mass XVIII

This even applies where "chant" is written out on five lines:

Introit chant by Robert Rice

English has time-based stresses, so the notes are compressed in some cases (like "God" in "Let God arise") so that the stresses in the words come as they would be spoken. The stressed syllable "rise" is as long as the three notes on "God a-", in order that the next stressed syllable, "let" falls at the right time. But that would be extremely complex to notate in the normal way, so a different convention is followed.


Images: Sanctus from Mass XVIII, my origination; Introit for Sunday 17 by Robert Rice in his collection St Michael Antiphons.

  • I'm curious; how did you typeset the Sanctus? – Richard Aug 1 '18 at 19:19
  • @Richard I'd like to say it's terribly complicated and needs specialist software costing thousands, but in fact t's a font. And it's free. saintmeinrad.edu/the-monastery/liturgical-music/downloads/… – Andrew Leach Aug 1 '18 at 19:23
  • Interesting, thanks. i didn't know if it was LilyPond or a font used in another program. – Richard Aug 1 '18 at 19:24
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To add to Andrew Leach's answer, another historical example of music without time signatures is the French prélude non-mesuré for harpsichord or lute, which was in vogue during the mid=to-late 17th, early 18th century. Composers of such pieces didn't even notate rhythms, leaving those up to the performer. (Although of course certain implicit stylistic conventions would have been assumed known to any competent harpsichordist or lutenist.)

An example of an unmeasured prelude with sound and notation.

  • this seems to not have a constant tempo either – foreyez Aug 2 '18 at 15:51

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