Although I usually stay at PO, I never noticed the music on the bus. What is piped into POR and POFQ resorts is Lionel Hampton Greatest Hits and Preservation Hall Jazz Band New Orleans, Vol. 1 (don't confuse this with their album New Orleans Preservation, Vol. 1). You can sample the music on Amazon and see if any of it rings a bell for you.
Try this familiar banjo tune that the attached website attributes to "Dixie Landings area" (former name of Port Orleans resort). http://www.parktunes.com/sections/63
Here is another website that lists 20 artists on the "Dixie Landings"-area music loop. The artists are broken down to cd level, not song level, so you would have to sample the cds. Just click on the link and you will be taken to Amazon.com for sampling.
This is funny you ask. My DS6 noticed this music and like PP stated it stays in your head. He stated it sounded like the music from the cartoon "Barnyard" so if all else fails you could try that.