1) Super Bowl XXI: Entertainment was a "Salute to Hollywood's 100th Anniversary" with drill teams and dancers from high schools in California.
2) Super Bowl XXV: New Kids on the Block.
3) Super Bowl XXXV: Britney Spears, Nelly, Aerosmith, Mary J. Blige, and NSYNC.
4) Super Bowl XLII: Tom Petty
College Marching Bands were the halftime entertainment for the first three Super Bowls. In Super Bowl IV, played at Tulane Stadium in New Orleans, Carol Channing was the star of the halftime show whose theme was the Mardi Gras.
http://en.wikipedia.org/wiki/List_of_Super_Bowl_halftime_shows for the whole list of performers including the 2011!
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Tom Petty & The Heartbreakers
The entertainment during half time was the marching bands from the Universities of Arizona and Michigan.
The marching bands for the University of Arizona and the University of Michigan performed at halftime of Super Bowl I.
The Steelers had 4 penalties for 32 yards in the first half of Super Bowl XLV.
21
The band "The Who" performed during half time of Super Bowl XLIV.
Doug Williams of the Washington Redskins in the second quarter (first half) of Super Bowl XXII against the Denver Broncos.
James Harrison had a 100-yard interception return for the Pittsburgh Steelers to end the first half of Super Bowl XLIII.
Elton John has not performed in any Super Bowl halftime shows ( thru Super Bowl LI ).
The halftime score of Super Bowl IX was: Pittsburgh Steelers 2, Minnesota Vikings 0.