Ok,I looked all around for tuning suggestions on certain songs. I am finding some deathmetal and black metal bands play in drop C.Fine. However I find many variations like:

C F Bb Eb G C and they call it drop C,
but why is drop C considered

C G C F A D ?

Can anyone shed some light? Thanks.
Because C G C F A D is a whole step down with the D dropped to C. The other tuning is 2 steps down and i have never heard it being called drop C.
It's gonna be a blue day
Probably got a bad tab, where someone assumed it was drop C

Said already, but that's C standard mate.
Quote by gorecore=me
is a bidet a type of crisp?