Nirvana is one of the most influential bands of all time. After leaving us with only three studio albums and the greatest MTV Unplugged album of all time, Kurt Cobain left his mortal coil. Fans have been thirsty for new material…any material from the band. Over the years, people have leaked demos and the latest one is maybe the biggest of all time. The most recent leak, though not yet authenticated, is among the most extensive yet. John Purkey, a musician from Tacoma, Washington, has uploaded demo tapes he claims Cobain gave him in the late 1980s and ’90s to YouTube (for real). In all, there are four tapes with over two hours of music total. Check em out below.