HazardsMind:
You need to look at the Tone example. From there you can see the it needs a certain library that has all the tones in it. Now once you understand how that example works, you can modify it to output a tone if a certain "pin" goes HIGH and go silent if the pin is LOW.Also if your familiar with a normal piano, Do to Do is an octave, and there are also different scales that you can program into the code too, if you want to get fancy.
What do you mean by the bolded part ? Somehow confuse.
Thank you