Actually, I'd never heard of him until I read the Fleetwood Mac article so to me, he's not best known for anything.  Got a reliable source in which a representative sample of the global population has been queried on what, if anything, they know Jeremy Spencer for?  That's what you would need to turn "best known for" from an assumption into a useful fact.  Why would you want to force your opinions into the article, when you can simply state what he was, as I did in my edit?  What do you think you are adding to the article? 190.162.52.196