dual piezo to one analog input

Hi guys,
Can anybody help me with a sktch that makes an arduino board read two PIEZOS from one input?
I somehow stumbled on this post.
http://www.instructables.com/id/How-to-access-5-buttons-through-1-Arduino-input/?ALLSTEPS.
But it talks about buttons instead. I want the PIEZOS to be able to trigger different midi drum notes.
Thanks in advance.

Unless one piezo gives a consistently higher output than the other, I don't think you can.