Originally Posted by PedroBourbon
Because he became muslim and changed his name to Yusuf Islam, that is exactly why.
That could be it. Or could it be that he is perceived as more of a pop singer than a rock-n-roller? Who would be similar artists that were already inducted? Percy Sledge? James Taylor? Solomon Burke? Dion? Donovan? Leonard Cohen? Plus he quit at the height of his success and then didn't come back for 17 more years.
I know there are a lot of pop, folk, blues, jazz and country artists in the RRHOF but I hear his music and I don't think Rock n Roll.