Which singer's 1990 debut single was "Vision of Love"?

The singer whose 1990 debut single was “Vision of Love” is Mariah Carey.

“Vision of Love” was Mariah Carey’s debut single and the lead single from her self-titled 1990 debut album. Released by Columbia Records, it introduced Carey’s extraordinary upper register, melisma, and gospel-influenced vocal style to a mainstream audience. The song became her first number-one single on the Billboard Hot 100.

Its success established a pattern that made Carey one of the defining vocalists of the 1990s. “Vision of Love” won Grammy Awards for Best Female Pop Vocal Performance and Best R&B Song, and its ornate vocal phrasing influenced many later pop and R&B singers.

The other options are artists who became major figures in R&B and pop, but their debut timelines differ. Brandy’s debut album appeared in 1994, Mary J. Blige’s debut album What’s the 411? arrived in 1992, and Toni Braxton’s self-titled debut album was released in 1993. None was responsible for Carey’s 1990 breakthrough single.