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Every Friday night for the past 25 years, Mel Stiller has sat at the piano at Jacob Wirth Restaurant, pounding out tunes, including requests, from 8 p.m. till midnight. From music and from memory, Stiller plays oldies from the ’50s, ’60s and ’70s, and books with the words to various songs are handed out to patrons of all ages. “You can end up with the whole restaurant, 275 people, singing along,” says restaurant manager Meaghan Fitzgerald. On Feb. 7, Jacob Wirth is celebrating the piano bar’s 25th anniversary with a fundraiser for the Joslin Diabetes Center, in honor of Stiller’s granddaughter, who was recently diagnosed with juvenile diabetes. The restaurant, located in the Theater District, will donate the night’s proceeds to Joslin. Oh, Stiller also plays there the 5th Saturday of the month, which happens a few times a year.