I'm not sure that any music that came before surf demonstrated the electric guitar's ability to bring out animal aggression. While that is certainly only one potential aspect of the 60's music, it was done so well that plenty of groups are still latched on to what was laid out then, while building on it and taking cues from surf's offspring metal and punk. I call this category "rad" mostly because it rhymes with trad and mad. While they aren't solely judged by the intensity and tenacity of the music, it certainly doesn't hurt!