One of the most critically respected female artists of the last thirty years, P.J. Harvey could be classified in so many ways.  Singer/Songwriter.  Lo-Fi Superstar.  Alternative Goddess.  Frankly, we could come up with so many more.  

Since her debut album in 1992, Mary J. has shown an evolution from a streetwise Hip Hop star to a Soulful Diva.  Her tough sexuality has made her an icon and her career progression shows no signs of slowing down.  The amazing this is with Mary J. Blige’s progression she kept her initial fans while obtaining new ones.  This type of cross over appeal and career consistency makes her stronger every year.  There is a greater chance here than you might think.

The Ska/Pop hybrid that No Doubt created in the mid 90’s found a huge following and made Gwen Stefani the Debbie Harry of her era.  No Doubt managed to gain both an Alternative and Pop following, though their future efforts were primarily danceable Pop.  Stefani is the key here, as her solo career skyrocketed and though it was not necessarily in the Rock vein, her overall efforts (which is still growing) could propel her band to Cleveland.

Although they may have the most dedicated following of anyone on this list the odds of Insane Clown Posse ever getting into the Hall could be the lowest of anyone on this list.  Sure they sold records and filled concert halls and literally created their own brand; but it was that cartoonish Hardcore Hip Hop style that gained them little fans in the critical world, and for every music fan that reveres them, there can be easily found a fan who detests them.  Not exactly the formula for induction, not that ICP or their fans would care anyway.