"Anyone Can Whistle" is Sondheim. 1964, I think. (One of the most popular songs from it is, ironically - "There Won't Be Trumpets".
)
The score is not all that high, as I remember. I don't remember it going above a C anywhere and I was playing lead, but it has been a long time since I played it (well, more than 15 years, anyways....). A few tricky rhythms, but not anything really awkward. I had a good time with it.
Hope that helps-
Best,
Sandy