Led Zeppelin (or as I like to derisively call them, Fred Zeppelin, who are not to be confused with Dread Zeppelin) has famously and relentlessly over-played and over-killed from the moment that John Bonham had decided that drinking 41 shots of whiskey was a good thing. However, it seems that for the past few years the only song that gets played on the radio, is of course "Highway to Heaven". There are a slew of non-radio hits that don't get played ("Going to California" for example) that should, since they're perfect for the Classic Rock/Adult rock format, 'cause you know damn well that nostalgia is money, and money makes the bean counters extremely happy, and that makes Wall Street cream their pants.
The only Black Sabbath song that you will hear with any kind of regularity is "Paranoid". Maybe "Iron Man" every once in a blue moon, but "Paranoid" for redundancy. There is so much excellent Black Sabbath music out there, both with Ozzy and with Ronnie James Dio, that should be played, but isn't. I got into Black Sabbath way late in my life, but from what I've heard, I can safely say that programmers from the aforementioned radio formats are also missing a pure money maker. With so many listeners tuned into the pseudo hard rock/dark rock that passes for music, it's a no brainer that Black Sabbath should be added to the playlist.
The heir apparent to The Guess Who, BTO is arena rock at its best. Another band with a good catalog of radio friendly hits, this band should be played more often than their hit "Takin' Care Of Business." While this is a good song, there is a lot more to the band than simply that increasingly overplayed song.
"Let It Ride" is a good example of the type of song that can get that all important 35-45 age group that's quickly becoming the major player for spending money.
To close out part two of what seems likely to become an ongoing series, I leave you with an example of entire genre that is non-represented on the radio today. Namely, novelty/parody music. This particular song comes to you courtesy of my memory and via a comment on Facebook a few weeks ago.