Update 2021-08-14: the TPL Search Dashboard is still around, but no longer appears to use a WebSocket (at least, a public one that I can find); so this project is currently nonfunctional.
This page uses the same WebSocket feed of anonymized realtime search data from Toronto Public Library as the Search Dashboard. However, it streams it to the Speech Synthesis API of the browser rather than to the screen. Hearing sound depends on your browser's support for speech synthesis.
Use the controls to start and stop the library voices.