Is this one, called "Must Be in Memphis", sung by Harlan T. Bobo. It's not so much a love song to the city, but a love song to the bad ideas that come with just the right combination of humidity, booze and encouragement.
A few sample lines that will probably resonate with a handful of you:
"I've been here five hours and made six bad decisions"
"We crashed a big party / drank all their whiskey…I learned that this guitar could float."
"I'm feeling my best and acting my worst, Lord, I must be in Memphis tonight."
Take a listen: