In the three years that Rob Caplin has been rocking receptions with Boston Party Machine, he has yet to play “The Electric Slide” or “Macarena.” In fact, those tunes are among the top five that couples have stricken from their lists, the bassist says. The eight-piece band will be one of several taking part in a free wedding showcase Tuesday at Johnny D’s where couples can check out bands, DJs, and photographer/videographers.
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