On Pat Metheny's Travels album, there's a live recording of Farmer's Trust. It has birdsong added in by one of his band members (the name escapes me)

For a long time the version in Spotify didn't have these.

In a similar vein, in Vince Guaraldi's Live from Grace Cathedral album, you can hear coughing from the congregants in the background of some songs, notably Theme to Grace. Crush the dynamic range and it disappears