Whom did Mariah Carey duet with on her 1992 version of "I'll Be There"?

Mariah Carey duetted with Trey Lorenz on her 1992 version of “I’ll Be There.” Carey recorded the performance for MTV Unplugged, where she sang Michael Jackson’s original lines and Lorenz handled Jermaine Jackson’s parts.

The song was a last-minute addition to Carey’s unplugged set, taped on March 16, 1992. Its warm, conversational arrangement turned the Jackson 5’s group recording into a romantic duet. Columbia Records released it as a single after radio and viewers responded strongly to the performance.

“I’ll Be There” became Carey’s sixth US number-one single, topping the Billboard Hot 100 for two weeks. It is sometimes mistaken for a duet with another major R&B singer, but Lorenz was Carey’s backing vocalist and collaborator on this recording. The pair later performed the song together at Michael Jackson’s 2009 memorial service.