You might enjoy this classic site - youarelisteningtolosangeles.com - ambient music overlaid with live police chatter.
The creator has made other versions since; the Quebec one is nice if you want a different language.
"Most San Francisco Police radio is now encrypted and no longer available Unfortunately, all SFPD traffic aside from initial dispatch and response has been encrypted and no longer accessible to the public. San Francisco has moved Police, Fire and EMS to a new digital system. Fire and non-police Emergency Services are still non-encrypted for many of their channels, so this will constitute the majority of the stream."
a little spooky to hear about someone being talked down off the golden gate bridge
doubly spooky during the Giants-world-series riots