The Chantels were very significant historically as they were among the first girl groups to chart with hit songs. They were not as successful (or as good, frankly) as many of the other girl groups that they set the stage for, but they did help to open that door, and they were good enough to get a look from the Hall. They have been nominated before, so their chances for a future induction are actually decent.
Perhaps better known now for being Keith Emerson’s band before Emerson, Lake & Palmer, the Nice had the distinction of being one of the early Progressive Rock Bands of note. Their blend of Psychedelic Rock with Jazz and Classical led to unique arrangements and though they were not a hit with critics or with a large assortment of fans, the groundwork they helped build was very important in launching the Progressive Rock genre as a mainstream musical option.
Pete Townshend is already in as a member of the Who, and he is likely the only one from that band that has any reasonable shot at a second induction. Considered the brains behind the Who, Townshend continued that a series of provocative solo albums. He managed a few hits, and was still able to Rock out when needed, but his focus on his other writings led to a solo career that was not as extensive as it could have been. A second induction for Townshend while possible is probably doubtful.
Justifiably in the Country Music Hall of Fame, the brilliant songwriter, Marty Robbins had an abundance of crossover Pop success. Robbins’ soft handed story telling ability had an appealing charm that garnered him many fans. What is forgotten is just how versatile Marty Robbins was, as he could “rock” out with the best of them when he wanted to and a look at his overall library of music is actually quite diverse. It is not impossible to think that the next Country flavored star could be Mr. Robbins.