. If all that was needed was
to specify a duration, then it might not matter since four quarters is
the same as two halves. However then, David's suggestion of using
ly:duration? would make much more sense.
I agree, but my last observation was not associated with the initial question, nor to Lilypond; it shows an ambiguity which is associated with the italian language.
For mysterious reasons the term "rational" has a different meaning in italian than the english/french one, then a note on the documentation is desirable...
Best,
P
-- Aaron Hill