Musical Codes

As we approached this location, we heard, "booooooooooooooonk......beeeeep.... biiiiink.....booooooooooooooonk.......................buuuuuuuuuuuuuuunnnk..... .......beeeeeeeeeeeeeeep...........booooonk......beeeeep! A loudspeaker was playing strange, atonal music. Each note would play for a few seconds or longer. Then a different frequency would be played. Nearby, a round building had hieroglyphics or pictograms (puzzle enthusists will recognize this as a rebus.) around the outside of it. When you decoded that, it said something like, "Tropic welcomes you to the hunt for paradise.   The music's the key - A telegraph key." The music was very very slow Morse code (dit, dit, dah, dit!) and it spelled out this puzzle solution.