Yes, yes, it's really sad and everything that Bob Seeger died. My condolences to his family.
But seriously, I think it's overdoing it a bit to refer to the "Like a Rock" and "Strut" crooner as a "folk music pioneer." It's perfectly competent lite country-rock, I suppose (not really my kind of thing!), but it doesn't sound like folk music to me.
The New Seekers on the other hand? Sublime.