"The Sporting Cowboy" is in the DigiTrad, with MIDI and score. The MIDI link is currently broken (the embedded player still works), but the MIDI and other materials can be downloaded from the DT mirror site sniff.numachi.com.

There are already several threads on this song; search for "When I Was a Cowboy". Most of the messages deal with a song or variant often associated with Leadbelly, about being an outlaw who rode with Jesse James, but interspersed are messages on this song.

There's a well-known recording of "The Sporting Cowboy" from the late 1920's or early 30's by Watts & Wilson; it's included on the wonderful compilation When I Was a Cowboy (Vol. 1).