Ha, quite a surprise, this thread.

First of all, I am the programmer of the game in my signature, Fountain of Youth. Now, to your point: the game you seem to be describing is "Indiana Jones and the Last Crusade" with the musical puzzle. Find more on google. It's commonly referred to as "Indy 3" as well. Fountain of Youth is more like "Indy 4" (Indiana Jones and the Fate of Atlantis) by the way.
Thanks for playing our demo!