Maybe most of you know of this site but I just found it.

Just type in any song that was ever played, and see what happens.
Then, following the end of the song, it will keep playing songs of the
same era forever. Or, click on "Channels" and pick your favorite
genre of m usic - great selection.

The very first song I added in, it didn't find - 'Innuendo' from Queen,
but then I typed in 'back in black' and It's been playing AC/DC and
other songs I like for over an hour and I've yet to hear any radio announcements.

http://www.theradio.com/