Wouldn’t it ?be nice if this were a brilliant collection of never-before-heard Jimi Hendrix songs recently discovered in some catacomb? Keep dreaming. On Valleys of Neptune, from ”Stone Free” to ”Red House,” most of these tunes are glaringly familiar. The good news: The alternate versions don’t seem (too) ?redundant, since Hendrix was one musician whose castoffs ?and outtakes are worthy of obsessive scrutiny. B?