○●   live audio online
○●   from open microphones
○●   (mainly) not speech or organised sounds (musics)
○●   changeable, often transient - eg Puako or Tabushima
○●   various sources

Reveil

○●   a live radio broadcast each year over the first weekend in May (IDCD)
○●   starts at 5am near the Greenwich Meridian (an imaginary division)
○●   travels west with the rising sun, relaying live sounds from streamers around the world.
○●   surfing the dawn chorus (Don Kroodsma, Gordon Hempton)
○●   a wave of sound that continuously circles the earth, completing a full circuit every 24 hours
○●   created by birds et al tuned to circadian clocks
○●   listen