The Bourbon Street Barn was an establishment in the city of New Orleans on Earth that featured live jazz music nightly.
The bar was a favored location of William T. Riker's and he recreated it in the holodeck of the USS Enterprise-D in 2364. Riker often visited the holo-program and played his trombone with the house band, performing such jazz classics as "Hula Blues" and "Sweet and Low".
On one occasion, shortly after the main computer of the Enterprise-D had been upgraded by the Bynars, the holo-character of Minuet took on enhanced properties. Riker was infatuated with the character and spent several hours in the bar with her. (TNG: "11001001")
The script for this episode originally referred to the bar as "The Low Note". According to the Star Trek Encyclopedia, 4th ed., vol. 1, p. 489, the Low Note was located on Bourbon Street in New Orleans.