"Rabbit in the Log", also known as "Rabbit in a Log" or "Have a Feast Here Tonight" is a song that was popularized by Bill and Charlie Monroe in a 1938 record. They learned it from a recording by a group called the Prairie Ramblers (1933 with fiddle lead; re-recorded 1935 with harmonica lead and a jug accompaniment). The Prairie Ramblers, Kentuckians, sang on the WLS (Chicago) National Barn Dance. Their source for the song is unknown. There's a one-verse fragment, identified as of African-American origin and collected in 1913 in Brown's North Carolina Folklore, Vol. III, #166, as "Rabbit in the Log". The tune is the same one used by the Carter Family for "Gospel Ship" (in the Legacies section). I learned this at Penn State from Dan Estersohn who probably got it from the Monroe Brothers recording.