How many Different tunings do you know? Today (18/06/08) i was looking in a magazine and it mentioned the tuning for 'Kashmir' by led zep (D,A,D,G,A,D) so I tuned to that and then tuned every string half a step down (C#,G#,C#,f#,G#,C#) And it's a bit odd. I'll have to get used to it. I usually use Drop-D (D,A,D,G,B,E)
I use two tunings. I use Standard and also D6/9 (D, A, D, F#, B, E). I keep most on my guitars to standard and one to D6/9.

Each of the six strings can be alternately tuned as low as a whole step lower and as much as a whole step higher without stressing the neck or the strings. With five possible tunings for each string (+2, +1, 0, -1, and -2), there are as many as 15,625 possible tunings for a six-string guitar.

There we go.
I know of A few bands that play in drop Db (Db, Ab, Db, Gb, Bb, Eb), Alexionfire just to name one. I know loads of tuning though. I think the lowest I've ever gone was drop B, but the only one close to that I actually use is 1 1/2 step down, just for BTBAM. I don't think i've ever tuned up though...
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There we go.

So TS, inclined to learn every single tuning ?
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I mainly use standard and drop D, although my acoustic is always in either dadgad or D minor tuning

I've used drop B before for alter bridge - broken wings, and a few open tunings for slide but that's about it
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You don't realize the possibilities without mathematics.

But, mathematics won't tell you what's going to sound well...

My favorite tunings as of late: DAEF#BD
Ok. I didn't know that there was *checks again* 15,625 different tunings. I'll certainly try the DAEF#BD and the DADF#BD. I recently tuned my guitar to C#G#C#E#AD