The folks in charge of nominations for the Hall have a blind spot with respect to so-called prog-rock of the seventies. Jethro Tull's not in the Hall, and neither is King Crimson. Larry Coryell, I'd think, would be worthy as well. More generally, the Hall seems more focused on country, blues and R&B as "roots' music with respect to rock, ignoring those bands whose sound derives from the traditions of jazz and improvisation.