Read Musicman's post again. He hits the nail right on the head.
The addition of a score would not tell this story better.
The play is worth reading. So is the historical context and having the knowledge of who the principals were in the Scopes trial: Clarence Darrow, William Jennings Bryan and H.L. Menken, all of whom are presented in fictionalized form in this play and film.
The Scopes trial concerned a small town teacher who became a test case, and he taught Darwin to his students breaking Tennessee law. The case attracted national attention when Darrow and Bryan entered the scene. Scopes was found guilty and fined $100 but the trial did lead to the law being changed.
In 1967 this was my 11th grade play. It was a controversial choice then since we did live in a conservative rural area of Pennsylvania. However the way the wind has been blowing the last 20-25 years, we could not have mounted the show today.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher