If you were old enough to buy CDs in the ’90s, you may remember listening stations at superstores that featured music by some of nature’s noisiest creatures: birds. These CDs blended classical music ...

Part 1. 'I don't do calls' -- Crossing the sound barrier -- Tone and timpre -- Pitch and frequency -- Rhythm and timing -- Part 2. Put it all together and what have you got? -- Simple calls -- Simple ...