Who is the black male singer with the last name Majors from 1970 - 1980?
I wonder if you are thinking of Major Harris. He was with the r&b group the Delfonics, before going solo in the early 70s. His biggest hit was "Love Won't Let Me Wait," a top-5 song in 1975. Major Harris died in November 2012 of heart failure.
I'll try to answer what I assume you are requesting -
The song title "I'm Changing" that was performed in the movie 'Dream Girls' was never a Motown song/recording.
The movie is a loose fictionalization of The Supremes and none of the songs were Motown recordings.
also see: Wikipedia http://en.wikipedia.org/wiki/I_Am_Changing