One hundred years ago this past Friday — July 10, 1926 — at 40 minutes past midnight at a frantic South Side jazz age party, Al Katz and his Kittens were playing the Moon Lite Gardens at the Chicago Beach Hotel in Kenwood. The crowd cried out "Valencia! Valencia!" the dance craze of the moment, and with a clatter of castanets, the group swung into the number. "Its exotic rhythms sent gilded heels gliding across the glistening floor," Radio Digest noted, after the tragedy. "Sparkling lights,…