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Soundgarden are giving fans an early peak into their vaults.  They recently shared a demo version of their hit "Black Hole Sun," which will be featured on the upcoming 20th anniversary edition of their classic album Superunknown

Pitchfork says the track was originally recorded by frontman Chris Cornell in 1994.  Soundgarden's Superunknown reissues will come with even more demos, B-sides, and rehearsals.  Deluxe and "Super Deluxe" editions are due out June 3rd, while the band plans to release Superunknown's singles and B-sides on vinyl this Saturday for Record Store Day. 

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