Deep Cuts from Famous albums

Yes - Cinema

Genesis - Blood On The Rooftops

Floyd - When The Tigers Broke Free

King Crimson - Book Of Saturdays

Kansas - Death Of Mother Nature Suite

Big Big Train - Wind Distorted Pioneers

IQ - Through The Corridors

Pandora probably plays everything though. I don't think they have a dj arbitrarily choosing which ones are good (or popular) and which ones aren't. I've never heard any of those on regular radio (or at least not in a very, very long time). Plus they would be very likely to be played by Sirius XM's deep tracks channel. 

I'll play.  

Works I felt deserved more attention are:

Yes - "Then"

Rush - "Open Secrets"

Kansas - "Apercu"

Porcupine Tree - "A Smart Kid"

Genesis - "The Lamia"

Jethro Tull - "A Passion Play"

Frank Zappa - "Zoot Allures"

Pink Floyd - "Burning Bridges"

Off the top of my head.

Pandora is very oddly formulaic in the sense that the more times you frequent their stations, the more of the same tracks you get played to you! For a progger, this is the opposite of what I'm looking for.

If Pandora plays ''everything'', it's definitely not prog. And no, they do not have a DJ for that. 

If you mean Radio Radio, then you get mainstream, and that is certainly not ELP or Crimson. Prog stations tend to play the "standouts" for the most part - I'm sure on that part. I don't know anything about Sirius XM though

Among prog fans no Epitaph isn't a deep cut but then you could say the same about "the great deceiver,""starless" and other King Crimson songs. The op wasn't clear about this but since this song has probably(or coud be) played on the deep tracks channel like I already stated it seemed like fair game to me. The title track to the first KC album and schizoid man are also deep tracks to most classic rock fans and in general but not to prog fans imo. But Epitaph being less known seemed like a better choice to me. Heck, I even talked to a guy old enough to know about KC but never even heard of them. But prog fans know a lot more than just Epitaph trust me. But again I'm going by the general rock audience and not prog fans (If I was doing the latter then I would certainly agree with the gripes about it not being a deep track). 

When I said "everything" I meant any random song by a prog band and they seem to only play the major prog bands and nothing too obscure (based on what I've seen). Anyway, we all have our opinions on this so really no sense in arguing about it and going around in circles. EODAFAIC.

Different opinions about what a deep cut is. Someone mentioned Cinema by Yes. That won a grammy award for best instrumental so you could argue that isn't a deep cut either for that reason. Anyway, I know very well what a deep cut is. Maybe you don't. I listen to the deep tracks channel on Sirius XM regularly and so I obviously know what kind of things they play (and they play stuff more well known than KC). Also, I have listened to the reguar radio for over 40 years and rarely if ever heard any of the songs on my list on there including Epitaph but it qualifies anyway based on your statement of "less widely played" alone not to mention "played less than well known than the other songs on the album." I'm not going by pandora or internet radio because that's absurd imo. Anyway agree to disagree.