According to the National Park Service at the Washington DC Frederick Douglass Historical Site:

Douglass played the violin for his grandchildren and guests when they visited Cedar Hill. He frequently performed for his grandchildren after supper and before their bedtime….Douglass would appear in the door leading from the hall or West Parlor into the dining room with his violin in hand. He taught his grandchildren slave songs he learned as a young slave. The grandchildren sang and clapped their hands while Douglass tapped his feet….

https://www.nps.gov/museum/exhibits/douglass/exb/homeinWashington/FRDO2505_violin.html

In the words of Dr. Douglass himself:

“I sometimes (at long intervals) try my old violin; but after all, the music of the past and of imagination is sweeter than any my unpracticed and unskilled bow can produce. So I lay my dear, old fiddle aside, and listen to the soft, silent, distant music of other days, which, in the hush of my spirit, I still find lingering somewhere in the mysterious depths of my soul.”

Holland, Frederic May. Frederick Douglass: The Colored Orator (1895 edition), p. 335.

Frederick Douglass listens to his grandson Joseph Douglass, also a violinist: