Every Wednesday night, at 11 o’clock, sometimes a little after, in a little room in a little club on Columbus Avenue in Boston, pianist Michael Kreutz plays his closing number, “What I Did for Love,” a song from the hit musical “A Chorus Line.”

Wednesday is show-tune night at the Napoleon Room at Club Cafe, and for three hours Kreutz sings and plays and other people get up and sing, so many faces and voices familiar, but always some new ones, too, every week different.