For anyone who hasn't found it yet, the most attractive website for Stephen Foster songs is: Foster
Click on the whirling note above music archive, then click on Foster songs at the top of the page. Both midis and text are given. Midis very good.

Clicking on Popular Songs will bring up the popular songs, anon. and by other authors, of that time period. Note: a few songs are listed as traditional which have known authors for the lyrics; the statement is true for the music.