It’s not often anymore that Carly Simon performs onstage, but she did Saturday, joining the fun at a fund-raiser called Breast Fest, held at Dreamland Ballroom in Oak Bluffs. Simon sang one song, called “I Can’t Thank You Enough,” which she co-wrote with her son, Ben. Simon was preceded onstage by a slew of female singer-songwriters from Martha’s Vineyard and New York, many of whom joined her onstage to sing backup.
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