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Yes, hummingbirds do vocalize quite a bit. They make a high-pitched chirping sound and when the male displays to the female he will make a very sharp, loud "beep" sound. The humming noise is actually made by their wings not their mouth.
They make a very quick, high pitched chirp. There are alot of them around where I work so I get to hear it alot.
Yes; most hummingbirds make their own calls and songs, depending on the particular species. Broad-wing hummingbirds also create a "chase" note with their wings - it's very distinctive, especially in the males.
Yes, they make different sounds. Many make a dry squeaking noise. They do make a loud chirp when doing the mating J dive. If you see a hummingbird doing the J dive look just at the bottom of the J and you will see a female that is the object of the attention.
From what I can find, I wouldn't exatly call it a "song," however, as others here have noted, they do produce vocal noises, as well as the namesake "hum" from their wings (which they flap anywhere from 40 to 80 times each second).
Since this one has a few examples available, I'll stop here and just point out the links below (for audio and video recordings).
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