Far more than just the Andy Warhol endorsed ingénue who collaborated with the Velvet Underground, Nico had a very successful solo career of her own which helped push the boundaries of Experimental Rock and proved to be quite the musician in her own right. As she did not get in with the Velvets, it is probably unlikely that she will ever get into the Hall on her own, but she may deserve at least a look.
Often in the shadow of Elvis Costello (and to a lesser extent, Graham Parker) Joe Jackson was among the wave of stylish New Wave artists who were also accomplished songwriters. Jackson showed throughout his career that he was capable of manipulating any genre, and likely sacrificed album sales to pursue music that he found gratifying. It may have also hurt his chances for a Hall of Fame induction too.
She may not have had the Soulful sound of the girl groups that populated the airwaves during her run, but Lesley Gore didn’t need to have it. What she did do was speak for a generation of young suburban white girls with her Quincy Jones produced sleek Pop songs. It may not have been Rock with attitude, but her place in Rock and Roll history is undeniable.
With Steve Winwood already in with Traffic, his best shot for a second induction may lie with the Spencer Davis Group which was where he gained his first exposure. The Spencer Davis Group was a brief but powerful act that was one of the best British based Blues Rock band ever. The question for induction is not whether they had enough American hits (they did chart in the States), but whether they were around long enough or whether they feel Winwood does not need to get in twice.