Multiple notes out of one buzzer

Using Arduino Audio
1

I'm trying to figure out if it's possible to get my piezo element (as featured here:12.5mm Piezo Buzzer - Solarbotics Ltd.) to play more than one note at a time. does anyone know if this is possible?

2

Yes but you need software that wil produce a tone on multiple pins, then you need to mix those pins together by connecting each to a capacitor and all the ends of the capacitors to the piezo.

3

You can use this library and the playTone2 function.

4