Metallica - Minus Human (AKA "- Human")
From the album S & M
Tabbed by James Spairana

Tuning: Drop-Db (Db Ab Db Gb Bb Eb)

The opening is played purely by the symphony, but when the guitars come in, they both play this riff:

Eb[-------------------------------------------]
Bb[-------------------------------------------]
Gb[-------------------------------------------]
Db[-------------------------------------------]
Ab[---------------------------------------3-3-]
Db[-0-0-0-7--0--6--3-0-3--0-0-0-7--6-0-2--3-3-]

After playing that four times, both guitars then play:

Eb[-----------------------------------]
Bb[-----------------------------------]
Gb[-----------------------------------]
Db[-0--0--0--6-7-6-5-0--0--0--6-7-X-X-]
Ab[-0--0--0--6-7-6-5-0--0--0--6-7-X-X-]
Db[-0--0--0--6-7-6-5-0--0--0--6-7-X-X-]

After this riff is played once, James (the rythym guitar) repeats, while
Kirk (the lead guitar) switches to:

Eb[---------------------------------------------------]
Bb[---------------------------------------------------]
Gb[-7---7~~--7---7---13-/-14-/-13-/-12---7-13-/-14-14-]
Db[---------------------------------------------------]
Ab[-5---5~~--5---5---11-/-12-/-11-/-10---5-11-/-12-12-]
Db[---0----0---0---0-------------------0--------------]

Then, James Fetfield (Rythym Guitar) plays:

Eb[------------------------------]
Bb[------------------------------]
Gb[------------------------------]
Db[------------------------------]
Ab[-0-0-0-6--7--6--5--3--5--3--2-]
Db[-0-0-0-6--7--6--3--3--5--3--2-]
 
Kirk plays the following over it:

Eb[------------------------------]
Bb[------------------------------]
Gb[---7---13/14/13/12-10/12/10/9-]
Db[------------------------------]
Ab[---5---11/12/11/10-8-/10/8-/7-]
Db[-0---0------------------------]

That's all I have so far. . .but it's, well, correct (except for the spacing as it relates to timing, probably).