"The Moodys should be in if for no other reason than they were the masters of the concept album, the flow from one song into the next. They were/are all real, talented musicians. They actually played all of the instruments heard on their albums."
All true.
Also, in addition to being one of the key early innovators of album rock music, along with the Beatles, Kinks, etc., they have stayed together, occasionally deliver new quality recordings and toured to enthusiastic crowds for over 40 years despite having no real advertising or marketing machine behind them for over 20 of those years now.
What in the blue h-- else could the RRHOF ask?
Not that I really care all that much. I do not relate to the RRHOF at all really. I am a life long Moodies fan though and just have to point these things out.
They should qualify based on the popularity and influencial nature of "Days Of Future Passed", their first album together in their enduring popular form from 1967 (post Denny Laine), alone.