- The Discovery Channel: The humpback is only one of many strange underwater noises here.
- Discovery of Sound in the Sea: A very interesting page from the University of Rhode Island. . .seems the sea is a very noisy place.
The main thing which struck me about the humpbacks' songs, as you can read here, is that they have a discernable structure, and can be broken down into phrases. Different pods of whales have different variations on the song, and even among those pods, the song changes over time.