So, the way I think about it is that being inducted into the rock n roll hall of fame means that your body of work has had a major impact on the world of Rock N Roll. Subsequently, you don’t necessarily need to be a rock n’ roll artist to belong in that hall of fame. This is why artists like James Brown and Aretha Franklin were some of the earliest inductees. So if Kate Bush has influenced enough rock and roll artists, you could easily justify putting her in there.