Bobbie Smith was one of the lead vocalists of the great singing group The Spinners. He died last Saturday, at age 76.
http://www.nytimes.com/2013/03/21/arts/music/bobbie-smith-voice-of-the-spinners-dies-at-76.html?ref=obituaries
Mr. Smith and Philippé Wynne were often both featured on the group's songs--including "Mighty Love," from 1973, "One of a Kind (Love Affair"), also from 1973, and "Could It Be I'm Falling in Love," from 1972.
Here's a video, from YouTube, of a 1973 television performance of "Could It Be I'm Falling in Love." Mr. Smith sings lead for the first few minutes; Mr. Wynne (seen at the far right, in the video) sings the lead for the latter part of the song.
http://www.youtube.com/watch?v=dln3ifkCfXs
As the above obituary in The New York Times notes, Mr. Smith continued to sing with The Spinners until the end of his life; his last performance with the group took place a month ago.
Mr. Wynne left the group in 1977. He died in 1984, at age 43.