Hi David,

> What duration is equal to 1/20th of a whole note in LilyPond?


This works as expected:

{
  \time 1/4
  \tuplet 5/4 { c''16 16 16 16 16 }
  \time 1/20
  \tuplet 5/4 { c''16 }
  \time 1/4
  \tuplet 5/4 { c''16 16 16 16 16 }
}

The denominator of a #'note-denom time signature would look like this:

Hope that helps!
Kieren.

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