I gotcha!

Halford is "an act" bearing the same relationship to it's principle namesake / founder member as Van Halen to Eddie Van Halen, or Bon Jovi to Jon Bon Jovi

Seen, considered and agreed.

Have disentangled Halford from Rob Halford, links (plus the rest) added, and should now be squared up in CD albums as per your guidance.

(I'll take a look at Rob Halford in other worlds soon)