According to my sleuthing (mostly on thesession.org) this tune was recorded by Johnny McGreevy, who I guess says, "By Golly!" a lot, hence its other name. He likely learned it from Jimmy Neary, a Chicago-fiddler who maybe wrote it (?) and brought it back to Ireland.
I learned my version from listening to Donal McCague's new recording, "Bits 'N Pieces." It was also featured on Brian Macnamara's Tune of the Month. Check it out here: http://www.piperbrian.com/music/music_tunes.html
The tuning on Donal's recording is raised one half step from standard, so that is they way I play it here.