I've spent the last 10 years of my life compiling and posting the entire American Top 40 charts for every week in the rock era from 1955 (and working on 2007 to current).
I have a small group of guys working on these things nearly every day of the week to correct errors and make sure each chart is 100% accurate and complete.
So if you need a reference to all of the 50's, 60's, 70's, 80's and 90's Top 40 charts, you can find them here:
https://weeklytop40.wordpress.com/AND, I have, what I call
The Singles Chronology. This is a complete and accurate list of every song ever released no the Billboard charts in their chronological order from 1955 to 2013.
You can find those here:
https://singleschronology.wordpress.com/These are good for programming a Classic Hits, Pop/Top 40 station, even a Classic Rock station is you can weed through all of the chart entries to find your Classic Rock songs in there. But these offer a wealth of info you might want ot use on your stations. And best yet...
IT'S COMPLETELY FREE AND EASY TO USE!!!! You can copy and paste the charts easily to a Word file so you can refer to them when you are wanting to program music, or just wanting to look over the music of your past.
Enjoy it folks, and thanks RDJ for renewing my interest in broadcasting again. And if you enjoy the charts, please follow my site and keep checking back for new content being compiled.