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The red-breasted nuthatch is a bird that sounds like a penny whistle. It is a small songbird found in the western and northwestern parts of the United States as well as in Alaska and Canada.
Birds that whistle at night are the mockingbird, the whippoorwill, and the black crowed night herons. The great horned owl and some swallows also whistle at night.
Depends on where in the world you are, the question needs to be more specific.
A MockingJay
Yes. Some bird sounds can be easily described (e.g. an owl) wherease others are more difficult to describe, using words. Words like squeak squawk whistle hoot screech peep can be used to describe bird sounds.
a lyre bird can imitate 20 sounds of species of birds and some sounds of human objects
A bird whistle
All birds can learn to varying degrees. Some can talk, some whistle or mimic other sounds. Some only sing their normal song. Birds learn their songs from their parents and others in their flock. A captive bird will imitate you or other sounds they hear repeatedly.
The talking bird is a parrot. Other birds that make human sounds are the parakeet and mynah bird.
owls, (and humans, pretending to be owls).
The Lyre bird. There's an awesome video of it on youtube. It can do imitations of camera shutters and stuff.
Yes, a bird will usually sing when it hears another bird. We have a parakeet and when we whistle she answers.