A single song that epitomizes a band's "sound"

Might as well cover my favorite band since no one else will:

Pat Metheny Group - “Follow Me”

I thought about Rosalita, and Fourth of July Asbury Park (Sandy), but it seemed a little on the funky, not as hard-rocking side.

Early Metallica - Master of Puppets
Later Metallica - probably Unforgiven. Hell, they’ve recorded 3 friggin versions of it.