The original version of “Mockingbird” was by the sister and brother duo Inez and Charlie Foxx in 1963.
There was a popular cover in 1973 by Carly Simon and her then husband James Taylor. Simon does well but Taylor is horrible. He has no feel for R&B which he also proved on his terrible cover of “How Sweet it Is”. Stick to folk and country, James!
Taj Mahal did a much better version in 1993 with Etta James.