As long as it doesn't have words, I listen to any genre of music that fits my mood. Sometimes white noise does the trick as well. Somewhat related: I've found

As long as it doesn't have words, I listen to any genre of music that fits my mood. Sometimes white noise does the trick as well. Somewhat related: I've found audio of rain, wind, chimes, rivers, but never any ambient people noise--i.e. groups walking around on the street and talking in the distance.