Birth/death dates listed for group rather than an individual

While scanning the list of names of people with May 15th as a birthdate, I encountered the item for Johnnie Gray's Band of the Day.  The page gave what would presumably be Johnnie Gray's lifespan as 1921-2014 for the whole band.  I tried deleting that information but was told that I had to go to the Help Desk for that. So I did...and the Help Desk told me to go to the regular Edit Page.  So, that's why I'm here.   How can that information be deleted?  

There is no page on IMDB for this particular Johnnie Gray (who would likely be "Johnnie Gray (IV)"), and the band only has one credit, so it doesn't seem necessary to create a separate page for him.

Thank you.