A bird call has gone viral and taken people who grew up in the 2000s right back to their childhoods. I remember the same sound waking me up as a kid and soundtracking my teenage years. I asked an ...

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 ...