I tried the best I could to tab this song. it's an amazing song to learn.
also, you pick the high notes with your pointer,middle, and index finger and you
pick the bass notes with your thumb.

standard tuning

PART A

|-7-----7-----7-----|-7-----5-----3-----|-3-----2-----0-----|
|---0-----0-----0---|---0-----0-----0---|---0-----0-----0---|
|-----0-----0-----0-|-----0-----0-----0-|-----0-----0-----0-|
|-------------------|-------------------|-------------------|
|-------------------|-------------------|-------------------|
|-0-----------------|-0-----------------|-0-----------------|

|-0-----3-----7-----|-12-----12-----12-----|-12-----10-----8-----|
|---0-----0-----0---|----0------0------0---|----0------0-----0---|
|-----0-----0-----0-|------0------0------0-|------0------0-----0-|
|-------------------|----------------------|---------------------|
|-------------------|----------------------|---------------------|
|-0-----------------|-0--------------------|-0-------------------|

|-8-----7-----5-----|-5-----7-----8-----|-7-----8-----7-----|
|---5-----5-----5---|---5-----5-----5---|---7-----7-----7---|
|-----5-----5-----5-|-----5-----5-----5-|-----8-----8-----8-|
|-------------------|-------------------|-------------------|
|-0-----------------|-0-----------------|-------------------|
|-------------------|-------------------|-7-----------------|

|-11-----8-----7-----|-7-----5-----3-----|-3-----2-----0-----|
|----7-----7-----8---|---0-----0-----0---|---0-----0-----0---|
|------8-----8-----7-|-----0-----0-----0-|-----0-----0-----0-|
|--------------------|-------------------|-------------------|
|--------------------|-------------------|-------------------|
|-7------------------|-0-----------------|-0-----------------|

|-2-----2-----2-----|-2-----3-----2-----|-0-----0-----0------|
|---0-----0-----0---|---0-----0-----0---|---0-----0-----0----|
|-----2-----2-----2-|-----2-----2-----2-|-----0-----0-----0--|
|-------------------|-------------------|-2------------------|
|-2-----------------|-2-----------------|-------2------------|
|-------------------|-------------------|-------------3------|

|--0--|
|--0--|
|--0--|
|-(2)-| (let ring)
|-(2)-|
|--0--|

PART B

|-4-----4-----4-----|-4-----2-----0-----|-------------------|
|---0-----0-----0---|---0-----0-----0---|-5-----4-----4-----|
|-----1-----1-----1-|-----1-----1-----1-|---2-----2-----2---|
|-------------------|-------------------|-----4-----4-----4-|
|-------------------|-------------------|-------------------|
|-0-----------------|-0-----------------|-2-----------------|

|-------------------|-9-----9-----9-----|-9-----11-----9-----|
|-4-----3-----4-----|---7-----7-----7---|---7------7-----7---|
|---2-----2-----2---|-----8-----8-----8-|-----8------8-----8-|
|-----4-----4-----4-|-------------------|--------------------|
|-------------------|-------------------|--------------------|
|-2-----------------|-7-----------------|-7------------------|

|-9-----7-----7-----|-7-----9-----11-----|-12-----12-----12-----|
|---9-----9-----9---|---9-----9------9---|----9------9------9---|
|-----9-----9-----9-|-----9-----9------9-|------9------9------9-|
|-------------------|--------------------|----------------------|
|-------------------|--------------------|----------------------|
|-0-----------------|-0------------------|-0--------------------|

|-12-----11-----10-----|-9------9------9--------|-9-----7-----5-----|
|----9------9------9---|---10-----10-----10-----|---5-----5-----5---|
|------9------9------9-|------9------9------9---|-----6-----6-----6-|
|----------------------|------------------------|-------------------|
|----------------------|------------------------|-------------------|
|-0--------------------|-0----------------------|-0-----------------|

|-4-----4-----4-----|-4-----5-----2-----|-0-----0-----0-----|
|---5-----5-----5---|---4-----4-----4---|---0-----0-----0---|
|-----4-----4-----4-|-----2-----2-----2-|-----1-----1-----1-|
|-------------------|-------------------|-2-----------------|
|-------------------|-2-----------------|-------2-----------|
|-0-----------------|-------------------|-------------4-----|

|--0--|
|--0--|
|--1--|
|-(2)-| (let ring)
|-(2)-|
|--0--|

PART A
PART A
PART B
PART A
PART B
PART A

THEN PLAY THIS:

|-------12*------|
|-------12*------|
|----12*---------|
|-12*------------| *THESE ARE ALL HARMONICS*
|----------------|
|----------------|

this is a tricky song to master, but it's very rewarding.
I really hope you enjoy. it's undoubtedly the best classical piece ever written
and I hope I didn't mess this up!
please rate!

UPDATE 4/29/10: After watching a lot of videos of people playing it, there was a 
order that suits the song best.
I've also changed the last chords you strum.
Here's a link of a guy playing in the order:

http://www.youtube.com/watch?v=iqCt6PznJAI