As R&B took over top 40 in the mid-'90s, Boyz II Men were the biggest-sounding and best-selling male group of them all.

"It was a mix of everything that was great about Black culture," a Hofstra professor says of the genre, which burned bright in the late 1980s and early 1990s.

Boyz II Men's story and legendary career will be the subject of a feature film biopic. The group, who has spawned timeless hits like "It's So Hard to Say Goodbye to Yesterday", "On Bended Knee ...