Here is a fine introduction to the music of the Oregon Trail:
Other YouTube videos of historic fiddler Truman Price include "Wait for the Wagon," "Uncle Sam's Farm," "Mississippi Sawyer," and "June Apple."
By the way, the racist lyric to Oh! Susanna can be found at the Wikipedia page. Though we might today think of the song as some kind of traditional Appalachian folk ballad it was in fact a brand new hist song at the time of the Oregon Trail and California Gold Rush. It was penned by Stephen Foster in 1847 for a blackface minstrel show.