Whistle Bottle Modifier

This image of various sized whistles:
http://www.thingiverse.com/derivative:680

got me thinking. Scaling is RIDICULOUSLY easy with Blender -- and then printing out the new part is just as easy as the previously sized part. So why not make a part that benefited from this scalability?

So, I was thinking, there are all kinds of bottles out there. And adding a whistle to the top will basically form a resonance chamber of that bottle's note. Can anybody say Jug Band?