Tom Conrad, chief technology officer at Pandora, says professional musicians take 20 minutes to create each song fingerprint that describes things like vocal quality, guitar speed and type of melody.

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Included, along with Mary Landrieu, Claire McCaskill , Joe Manchin, Ben Nelson and Debbie Stabenow, are Sherrod Brown (Ohio), Bob Casey (Pennsylvania), Tim Johnson (South Dakota), Tom Carper (Delaware), Kent Conrad (North Dakota), Amy Klobuchar (Minnesota), Jim Webb (Virginia), Carl Levin (Michigan) and John Rockefeller (West Virginia).

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In addition to Chambliss and Conrad, the Group of 16 roster includes: Tom Carper, D-Del.

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