Gladys Knight and the Pips were with Motown from the mid ‘60s to the early ‘70s. Watch Gladys Knight as she talks about Marvin Gaye in a web-exclusive interview for “Marvin Gaye: What’s Going On” on American Masters. In her interview, Knight explains that before “I Heard It Through the Grapevine” even hit the record stores, she could feel a “certain magic” in it that told her right away that it was going to be a smash hit. “Marvin was dynamite in a cotton ball,” she says with a smile.

This week, American Masters features Web-exclusive video interviews with people who worked with Marvin Gaye at Motown Records. Here’s a sampling of what you’ll find there.

Songwriting Duo Ashford & Simpson
Husband and wife songwriters Nickolas Ashford and Valerie Simpson wrote several duets for Marvin Gaye and Tammi Terrell at Motown, including “Ain’t No Mountain High Enough.” In this extended interview, they talk about what it was like to work with the charismatic duo — up until Terrell’s tragic death in 1970.

Otis Williams
Williams, the last surviving original member of the Temptations, talks about what Marvin Gaye was like in the early days before his breakout singles and recalls a special moment he had with Marvin at the piano in a Motown studio.

Weldon McDougal
McDougal, who worked in promotion for Motown, recalls Marvin’s humility and genuine love of sports. He also discusses the difficulty of getting DJs to play What’s Going On because the album was so new in its approach.

Ben Fong-Torres
Ben Fong-Torres, who interviewed Marvin for Rolling Stone, says the process was like any other interview he ever did. Marvin “glided into view, and just suavely asked something like, ‘What can I bring you? A gimlet? Grass? A Cocktail?’ And so that was the kick-off for our visit.”

To watch all of these interviews, and for more web-only Marvin Gaye content, visit American Masters Online. “Marvin Gaye: What’s Going On” premieres tonight, Wednesday, May 7 at 9pm on Thirteen.