What song by The Jackson 5 was Motown's best-selling single?

What song by The Jackson 5 was Motown’s best-selling single? “I’ll Be There” was The Jackson 5’s best-selling Motown single.

Motown released the song on August 28, 1970, as the first single from the group’s Third Album. Written by Berry Gordy, Hal Davis, Bob West and Willie Hutch, it was produced by Hal Davis. The tender ballad represented a change from the group’s brisk early hits and showcased Michael Jackson’s lead vocal alongside his brothers’ harmonies.

“I’ll Be There” became The Jackson 5’s fourth consecutive number-one hit on the U.S. Billboard Hot 100, following “I Want You Back,” “ABC” and “The Love You Save.” It spent five weeks at number one on the pop chart and six weeks atop Billboard’s soul chart. The single sold about 4.2 million copies in the United States and 6.1 million worldwide.

“I Want You Back” and “ABC” are common mix-ups because they launched the group’s extraordinary run of hits. “I’ll Be There,” however, was the group’s most successful single and remained a landmark Motown recording.