Michael Cooper asks:

>Can anyone cite specific examples of (preferably classical) music wherein
>there is a denominator in the time signature that is not a power of two
>(of course, one=two to the zero power).

3/3 is just fine as a time signature.  Imagine a siituation where you want
the triplets to be the dominant rhythm in a hemiola.

As for what a "third" note looks like, its a half note triplet.

Stirling