based on Standard Tuning

some redundancies
Tuning 6 5 4 3 2 1
Standard E A D G B E
down 1/2-stp D# G# C# F# A# D# (std, down 1/2-step
Dropped std D G C F A D all strings tuned down a tone - Proud Mary
Standard Db Db Gb B E Ab db std tuning tuned down 1 1/2 steps - see also listed w/ sharps instead of flats
Standard C# C# F# B E G# C# std tuning down 1 1/2 steps (above listed w/ flats instead of sharps) /Kotke - lower 6th string to B and get Heavy Metal (below)
2 steps down C F Bb Eb G C this is standard down 2 full steps
std 1/2step up f Bb Eb Ab C F standard tuning tuned up 1/2 step- like std tuning w/a capo on 1st fret
up 1 full step F# B E A C# F#
Drop Db Db Ab Db Gb Bb Eb(Db) standard tuning tuned down a 1/2 step and 6th string tuned down another 1/2 step also try lowering the 1st string to (Db)
Drop D D A D G B E John Fahey- America
Double Drop D D A D G B D
Drop std/dbl C C G C F A C all strings tuned down a tone/step and then 1st & 6th tuned down another tone
Drop C C A D G B E - Desolation Row (Capo 4) - It's All Over Now Baby Blue (Capo 4)
Dbl Drop C C A D G B C both E strings dropped to C
low 1st E A D G B D Lowered 1st Tuning- 1st string tuned down a step - also called fake open G
E A D G A E the 2nd string is lowered from B to A
F# A D G B E std tuning w/6th string tuned up a full tone, but why?
E A Db G B E 4th string tuned down 1/2 step
D A D G B C just drops the 2 E strings; low to D, High to C
Drop combo C G C F A D combination of dropped standard (see above) and Dropped D. all strings tuned down a tone/step and then 6th tuned down another tone - Fahey - America 1967 break down version / fahey calls it Double Drop D - Godsmack's "Whatever"
E G D G B E G drone in the bass reminded somebody of the sound of the bagpipes
Esus11 E A E G B E
Lute E A D F# B E also called Vihuela Tuning (cf: Vihuela, below G C F A D G)
E A D A B E std tuning with 3rd string tuned up a step
Fake Open E E A D G# B E std w/ 3rd string up 1/2 tone
Fourths E A D G C F also called Bajo Sexto
Pipe Tuning E A D E A E std 2nd string tuned down 1 step, 3rd string tuned down 1 1/2 steps good for playing in key of A? Davy Graham / also called E Modal
Eb Drop Eb A D G B E
F A D G A E
E A E G B C
GuitarCuba-Cibao) E C d g b e
for Irish Tunes E A G D A E