Beatles' 'Ed Sullivan Show' drumhead, Kurt Cobain's 'MTV Unplugged' cardigan also far exceed pre-auction estimates
Singer recorded acoustic version of Nirvana classic at home on four-track recorder in 1988
Untitled song culls from cassette likely recorded around making of 'Nevermind'
"I didn't realize it was such a historical thing," 19-year-old Maggie Poukkula says. "I thought they were just cool pictures of my dad and Kurt jamming together"
"The dark stuff at the end I think would bum me out," singer says
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Kurt Cobain 'was a master of jerking your chain,' explains Buzz Osborne.