Deloris Carter – or, rather Deloris Van Cartier, as she has refashioned herself – wants to make it big in the music biz. As a young woman in 1977 Philadelphia, she longs for fame, imagining herself like Donna Summer, resplendent in a glamorous white gown and white fur coat. Instead, she’s a little desperate, in her thigh-high boots, too-short shorts and loud, spangled top. She thinks her thug of a boyfriend, Curtis, is the key to her dreams. But as her story unfolds in “Sister Act,” Deloris realizes the key to her dream is within herself.