Here's the sound we played as a clue. We asked you to guess what exactly it is and where exactly in the Bay Area we recorded it.

We played you this sound , and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it.

All week long, we've been playing this sound and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it.

This is Audiograph — the Bay Area’s sonic signature. Each week, we’ll play you a sound recorded somewhere in the Bay Area. Your job? Listen to the sound (in the player above), figure out where it was recorded, and what it is, then call to let us know.

All week long, we've been playing this sound and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it. This auditory guessing game is part of Audiograph , a crowd-sourced collaborative radio project mapping the Bay Area’s sonic signature. Audiograph tells the story of where you live, and the people who live there with you. Every Thursday, we tell you the story behind our weekly mystery sound on Crosscurrents , and here in weekly blog posts. Listen above for the

This is Audiograph — the Bay Area’s sonic signature. Each week, we’ll play you a sound recorded somewhere in the Bay Area. Your job? Listen to the sound (in the player above), figure out where it was recorded, and what it is, then call to let us know.

Here's this sound we played as a clue. We asked you to guess exactly what it is and where exactly in the Bay Area we recorded it.

All week long, we've been playing this sound and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it.

This is Audiograph — the Bay Area’s sonic signature. Each week, we’ll play you a sound recorded somewhere in the Bay Area. Your job? Listen to the sound (in the player above), figure out where it was recorded, and what it is, then call to let us know.

All week long, we've been playing this sound and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it.