Rock and Roll.
It isn't an unusually good genre of music, but the mystic that surrounds it is so delicious. It has become a metaphor for particular human qualities in a way that only classical music has really done before (and even then, not to the same extent). Rock and Roll isn't just music anymore; it is a standard to which we might rally. It is freedom, it is rebellion, one might even say that it is of the same essence as the spirit of independence that America likes to claim it embodies.
As a tertiary to this, I also love the group, Superchick. They’re a little more pop-rocky than rock and roll (and my tastes tend to turn towards metal anywho), but lately I’ve been digging several songs from their latest album (Rock What You Got, 2008), “One More,” “Alive,” and “Rock What You Got” in particular. "One More" in particular seems to nicely embody the Springtime of Youth spirit.