Did you know Nirvana rehearsed "Jesus Wants Me for a Sunbeam" (a Vaselines cover) three times before the live taping? Did you know they soundchecked "Heart-Shaped Box" with different vocal melodies? These rehearsal recordings are available exclusively on Archive.org. They are the musical equivalent of a diary entry.
Whether you're a lifelong fan or a newcomer to the Seattle sound, the archived recording on Archive.org nirvana unplugged archive.org