The Mission District in San Francisco is one of the city’s most densely populated and diverse neighborhoods. It’s where software engineer Riley Walz set up his Bop Spotter to capture the music playing in the area. Eric Risberg/AP
Eric Risberg/AP
Bop Spotter isn’t much to look at: it’s a plastic box attached near the top of a light pole located in the heart of the Mission District — one of San Francisco’s most densely populated and diverse neighborhoods.
But that box — which contains an old phone programmed to run the music identifier app Shazam — has been quietly capturing
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