>> rock, the music that infur rated so many people in the 50s and 60s. too loud, vulgar and dangerous to our morals. rock has not only refused to go away, it's become an institution. ♪ >> heart was a big deal because in a decade that was with a type of rock and roll that rhymes with rock and begins with a c and i won't go further, they were able to play on those terms. >> we were like we have to up it a notch. ♪ >> they have come to expect a better standard of performance,