A beer bottle musical...
I'm guessing there was a typo in an announcement for a "Battle of the Bands" --- and it ended up "Band of the Bottles" instead.
Their repertoire needs to include:
"The Beer Barrel Polka"
"Stout Hearted Men"
"What's Ale-ing Me"
"The Lager Winding Road"
... and anything by Porter Waggoner
I'll be here all week --- don't forget to tip your waitress!