Roberta Flack Photo: Jack Robinson/Hulton Archive/Getty Images Roberta Flack, the R&B musician whose singing helped define the subgenre of “quiet storm” in the 1970s, is dead at 88. Flack “died peacefully surrounded by her family,” per a statement from her publicists. “Roberta broke boundaries and records,” the statement said. “She was also a proud educator.” Flack loved classical music from an early age, earning a scholarship to Howard University at age 15. After graduating, she taught music