Mahalia Jackson
Mahalia Jackson sang Martin Luther King's favorite gospel song in 1968. This was at his funeral.
Marian Monroe sang after his funeral procession.
I know at least one person. Mahalia Jackson. She sang "Take My Hand, Precious Lord" at the funeral of Martin Luther King, Jr.
Mahalia Jackson Apex!
Mahalia Jackson
Smokey Robinson sang a song at Blue's funeral on the Temptations movie.
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Kim Burrell is the artist who sang the gospel song "Holy Spirit, Move on Me Now."
She sang How I Got Over The video on YouTube, from the actual March on Washington, really harsh; i.e, poor quality, probably do to it's age. They just didn't have the recording capability back then. You can do a search for the lyrics to the song. I found them on LyricsKeeper.com. I will not give them here because I am uncertain of the copyright status...
The Jackson Southernaires
Susan Graham
Abbey Lincoln.