Boston’s piano bars are almost gone

Jane Potter and her colleague Bob Baughman, who share the three-nights-a-week Copley gig, are the last piano players standing in what used to be Boston’s thriving piano bar scene. Their perch is unsteady at best. In January, the Plaza is planning a soup-to-nuts renovation of the bar and the adjoining high-end restaurant, the Oak Room, merging the two spaces into one, large, “American brasserie.’’