Fifty years ago today Bill Haley and the Comets recorded "Rock Around the Clock" at New York City's Pythian Temple. Blackboard Jungle featured Rock Around the Clock during the opening credits and the rest is history.
If you're interested in reading a pretty good synopsis of the past fifty years of Rock and Roll, you might enjoy this article from the New Zealand Herald. Below is their synopsis of 1991.
1991: Smells Like Teen Spirit and Nevermind. Seattle and Smashing Pumpkins. Bryan Adams' Everything I Do, Janet Jackson signs a US$16 million contract with Virgin for three albums. Miles Davis will blow no more, nor will Freddie Mercury. Pearl Jam's Ten and the Black Crowes. Lollapalooza. I'm Too Sexy For My Shirt. NWA's Efil4zaggin first gangsta rap album to top US charts.