Before Kendrick Lamar takes the field on Feb. 9, the letter notes that "past vulgar performances" might have been okay in those cities, but not in the Big Easy.

One of the major non-football storylines that centers around the Super Bowl is the halftime show. These days, the halftime show is one of the most exciting performances of the year and is headlined by some of the biggest artists of all time.

Janet Jackson's infamous wardrobe malfunction incident is also cited as an example of "past vulgar performances."