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Back in 1995, when I got my very first desktop computer featuring Windows 95, I remember one of the very first places I went on the web using Netscape Navigator was to the newly created ReelRadio. In case you're not familiar with it, it was one of the very first sites on the Internet that featured tons of radio airchecks that you could listen to for free via RealAudio.
I believe Dale Patterson's excellent RockRadio Scrapbook followed soon after in October 1996. Dale's site is still in existence. ReelRadio's founder, Richard Irwin, unfortunately passed away and the site languished, first instituting a paywall and then rarely being updated.
Now it's back, thanks to - of all people - the North Carolina Broadcasting Museum. They've relaunched the place, all for free, on a new site and everything that was on the old one is contained there, including thousands of airchecks featuring greats like The Real Don Steele, Cousin Brucie, Robert W. Morgan, Wolfman Jack, The Real Bob James and even Jay Nelson - just to name a few. They also feature several original radio documentaries on those long gone days that you won't hear anywhere else.
You can find the redesigned site and all its exhibits here. Along with Dale's incredible work, it's a great place to relive Top 40 history.