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Warped Tour evolves from its roots in punk

Warped Tour, a festival founded as a showcase for punk and other forms of alternative rock, is celebrating its 20th anniversary. Startlingly few concessions to nostalgia were evident at Thursday's tour stop at Cricket Wireless Amphitheater. Even fans with narrow tastes couldn't fail to notice that the music once closely associated with Warped Tour was occasionally difficult to locate. The transformation was welcome.