Angie Stone, a hip-hop pioneer in the late 1970s with the Sequence, one of the first all-female rap groups, who later switched gears as a solo R&B star with hits like “No More Rain (In This Cloud)” and “Wish I Didn’t Miss You,” died on Saturday in Montgomery, Ala. She was 63.

Her agent, Deborah Champagne, said she died in a hospital after being involved in a car crash following a performance.

Alongside musicians like Erykah Badu, Macy Gray and Lauryn Hill, Ms. Stone was part of the neo-soul movement of the late 1990s and 2000s, which blended traditional soul with contemporary R&B, pop and jazz fusion. Her first album, “Black Diamond” (1999), was certified gold, as was her sophomore effort, “Mahogany Soul” (2001).

A prolific songwriter with a sultry alto voice, Ms. Stone specialized in songs that combined laid-back tempos with layered instrumentation and vocals.

“Angie Stone will stand proud alongside Lauryn Hill as a songwriter, producer and singer with all the props in place to become a grande dame of the R&B world in the next decade,” Billboard magazine wrote in 1999.