they meant 'shine on' i would guess. i think its wonderful vocals. roger may not be the best vocalist but his voice and style are unique and i love it to this day, though i do agree that he seems to have difficulty during shows (take one of the many WYWH or Animls tour shows for example).

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We don't know what the hell it is, except that it's very large and it has a purpose.
-Dr. Floyd, 2010