DIY Yellow Jacket Trap - Cheap Easy 2-Liter Bottle Trick - All Natural

My dad and I make these to keep the yellow jackets from taking over his hummingbird feeders.
The yellow jackets like the smell of the fermenting sugars, so adding the baker's yeast speeds things up a bit.
Also:
I've never had any honeybees in mine.
I only use this in the late summer to protect hummingbird feeders.
Using protein (meat) is a good idea in the spring, but use sweets for fall.
You can use other sweet liquids.
I don't want to use poisons.
I don't care if you like the music or not.