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. If you think you can identify this Audiograph sound of the week, call 415-264-7106. Also, tell us where to record next. We’ll give away a KALW t-shirt every week to one lucky caller. We will announce the winner of this week's sound on Thursday during