The Ballad Of Ol' McCreary
This is the name of one of the tracks on Pianologues
. A pianologue is "a performance at the piano, sometimes with a verbal accompaniment by the performer." This one is meant to be religious, and is in the style of a cumbia
Many of the song titles that fill out Song Reader are references to older sheet music/songs, but best I can tell, this one is not--it's just a title Beck and whomever helped him made up.