Darcy James Argue wrote:
On 07 Jul 2005, at 2:12 PM, Christopher Smith wrote:

    But then later, you are playing some triplets which work out
    perfectly, but you ONLY NEED FIVE OF THEM, not six. If you needed 6,
    then a bar of 2/4 with triplets marked normally would be great. But
    if you want a new downbeat after you've only played FIVE
    eighth-note-triplets, then you're out of luck in standard metre
    systems. Then you would need a bar indicating 5 (or really 3+2) over
    whatever eighth-note triplets are in relation to a quarter note.
    Hey, we do the math, and you get 12 triplets in a whole, which makes
    them 1/12th notes.

    So you mark 5/12, and put in three eighths beamed together followed
    by 2 eighths beamed together, and I would put a bracketed 3 tuplet
    over the first group, and the same over the second group (even
    though there are only TWO notes in it) for clarity.


I'm really not sure that's clearer than a bar of 5/8 with a "quarter = dotted quarter" indication, which is what I would use in that situation.


Possibly true. But replace 5/12 with 5/10, and there's no easy change-of-tempo indication. Also, if you have these changes happening frequently (such as every single bar!), the x/12 system is far less messy.



If you didn't want to change the note value in the "denominator" and you didn't want a metric modulation, you could use a fractional time sig:

1+2/3
-----
4

A change to 5/12 is actually a change of the speed of the pulse. This is lacking in such a fracntional sig.
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