Roberta (Meryl Streep), a mother of two whose husband has left her, finds a sense of purpose teaching violin to East Harlem public-school students. Small Wonders, a mediocre documentary about the real Roberta Guaspari and her violin program, is preferable to this self-congratulatory 1999 feature, which artificially exalts the character—a classic saint with clay feet—by casting a grande dame and by reducing her motives to facile psychodrama. Wes Craven directed a screenplay by Pamela Gray. PG, 124 min.