Once Star to Bring Yet More Emotions to Parenthood

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143508399BG00015_Sundance_L Photo: Gareth Cattermole/Getty Images

Once star Glen Hansard will play himself on a December episode Parenthood, EW reports. The show has had a few musicians wander through, thanks to Crosby and Adam running a recording studio, but Hansard's appearance forces us to wonder: Just how gently can the show tug (strum?) a heartstring?