Can't Create my own Beatles iTunes Radio Station????

Why can't I create my own version of The Beatles Radio Station on iTunes Radio? Matter of fact, you can't do it with any of individual Beatles - except Ringo Starr's All Starr Band.

I realize there is a Beatles preset station - but on that one you can't configure artists to add to it like you can on stations you create yourself. Just about all the other artists that I tried to make a station out of allowed me to do so. Why not The Beatles?