Lilypond currently supports simple "irrational meters" like 4/10, 7/6, etc.
which are used by contemporary composers such as Ferneyhough, Adès, etc.
However, \compoundMeter cannot handle many of these complex notations. It
sometimes fails when an irrational component such as 1/10 is included in the
compound meter, and fails when a _fractional_ value such as 2/3 is included in
the compound meter -- as in Boulez' "Le marteau sans maître" where there are
time signatures such as (4 + 2/3)/8 .
I've attached 3 minimal examples, 2 which fail with the compound meter but
compile with the equivalent non-compound irrational meter; and one which
includes a compound irrational meter that works.
{
\compoundMeter #'((3 2 3 8) (1 10))
%\time 11/10 %comment out compound meter & uncomment this line
%to see the non-compound equivalent working
c'4. c'4 c'4. \times 4/5 { c'8 } |
}
{
\compoundMeter #'((4 2/3 4))
%\time 7/6 %comment out compound meter & uncomment this line
%to see the non-compound equivalent working
c'4 c'4 c'4 c'4 \times 2/3 { c'4 } |
}
{
\compoundMeter #'((4 8) (1 10))
c'8 c'8 c'8 c'8 \times 4/5 { c'8 } |
}
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