What’s one of the goals in the music business? Longevity. Nobody wants to be a one hit wonder, and everyone wants to stand the test of time. Yellowcard has been at it since 1997, so they have certainly proven they have staying power. And with their recent release “When You’re Through Thinking, Say Yes,” they may stay around for a while longer. We spoke with Sean Mackin about how they are trying to outlast U2 and The Rolling Stones.