The distinction between B and C could be a result of it not being in E standard. Guitar sheet music typically writes the music as if it were E standard (or Drop D if it's in any other drop tuning) no matter what note it is actually tuned to. This means that a song that is in Eb tuning that is actually in the key of B uses finger positioning as if it were in C (if you imagine that you're in E standard instead of Eb) and it gets written that way. This is done more or less for the convenience of not having to adjust your sight reading between different tunings.
Nevermind the key, it starts where a C normally is, and the song is either in standard tuning or half-step down.
It's in C major using C-F-C-Am progression in the verse and Am-C in the chorus. The bassline uses a b7 accidental (Bb) in the verse (in the end of the progression).
Quote by AlanHB
Just remember that there are no boring scales, just boring players.


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Quote by Artturi
Nevermind the key.....

Was that deliberate...? If so I applaud you, good sir....
Quote by AlanHB
It's the same as all other harmony. Surround yourself with skulls and candles if it helps.
Nirvana seem to be getting a bit in bogie around these parts, which is cool.

Nirvanas first LP (Bleach) was done all with Eb tuning IIRC, Sliver may have been demo'd back then, but that's unlikely since that was 1988 and it seems more of a 1991 sort of tune.