I don't know. Who sang the lead vocal on "Don't You Worry with Stephen Bishop"?
Peter Cetera sang lead vocals on 25 or 6 to 4
The song is "Stay" by: The Four Seasons
He never sang with the Temptations, but he was their band leader and lead guitarist.
John Lennon, with harmonies by Paul McCartney. John overdubbed the harmony on his lead vocal.
The Temptations sang Get Ready.
According to Wikipedia, it was Janis Hansen.
No, he didn't write it. But he sang the lead vocal parts.
The Temptations sang :"The Way You Do The Things You Do"
Smokey Robinson sang a song at Blue's funeral on the Temptations movie.
CHUCK NEGRON (THE ONE WITH THE MUSTACHE)
Paul Mccartney sang the main vocal part of When I'm Sixty-four
Michael Jackson on the album Ben The Platters also sang the Temptations song My Girl
Mike + The Mechanics Probably Paul Carrack or Paul Young.