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Seasons 1982, 1987, and 1991 were their Super Bowl winning teams.
Here's a link that will tell you all of the Super Bowl winners up to last year's Super Bowl, no new teams played the 2011 Super Bowl. It was played by Super Bowl veterans the Steelers and the Packers. The list at the bottom is up to date.
The teams have never played each other in a Super Bowl.
Washington and buffalo
Rams and Titans
The 49ers and the Chargers.
If you mean the Super Bowl that was played folloing the 1991 regular season, the half time act for the 1991 Super Bowl (Super Bowl XXVI) was Gloria Estefan with Brian Boitano & Dorothy Hamill. If you mean the Super Bowl (Super Bowl XXV) that was played in the calander year of 1991, the half time act was New Kids on the Block.
The New York Giants and the Buffalo Bills