~Friday 16th of April~
There seems to be one contemporary musician (genre: pop-jazz?) recording under the name Stephen Foster. His albums and tracks appear on this page.
The famous American songwriter Stephen Foster (http://en.wikipedia.org/wiki/Stephen_Foster) (July 4, 1826- January 14, 1864) was author of the words and music of some of the most well-known American songs, includijng "Camptown Races" and "I Dream of Jeannie with the Light Brown Hair". Since all his songs are firmly in the public domain