Gtr 1 is playing rythm.
Guitar 2.
e|---------------------------------------------------|
B|----5--5--5----5------------5-5-5------5-----------|
G|-7-----------------------7-------------------------|
D|-------------------7--5-----------------------7--5-|
A|---------------------------------------------------|
E|---------------------------------------------------|
Gtr 3.
e|-----------------------------------------------------|
B|--10(10)p8--10---10--8------8--10--10----10----10--8-|
G|------------------------9----------------------------|
D|-----------------------------------------------------|
A|-----------------------------------------------------|
E|-----------------------------------------------------|
Gtr 2
e|----------------------------------5--------5----------------------------------|
B|------------------------------5---5------5----8b 8b 8b 8b 8b--10p8--10-8------|
G|---7(7)--7(7)--7(7)-5-(6)--7b---------7b--------------------------------9-----|
D|------------------------------------------------------------------------------|
A|------------------------------------------------------------------------------|
E|------------------------------------------------------------------------------|
[ Tab from: http://www.guitaretab.com/b/black-sabbath/49145.html ]
Gtr 3
e|--------------------------------------------------------------------|
B|--8b--8b--8b--------------------------------------------------------|
G|---------------9---9b-------8---8-----10----10---10---10-----9------|
D|--------------------------x---x-----x-----x----x----x---------------|
A|-----------------------------------------------------------9--11p9--|
E|--------------------------------------------------------------------|
Guitar 2
e|-10b---------8--10b-10(10)--8-10-8-----8-10-10-10-10(10)8----12-12-12---|
B|-------8--10-----------------------8-10-------------------10------------|
G|------------------------------------------------------------------------|
D|------------------------------------------------------------------------|
A|------------------------------------------------------------------------|
E|------------------------------------------------------------------------|
Guitar 3
e|-----------------------------------------------------------------------------------------|
B|--12-----------10--12--12--12-12p10--12--10------10-12-12-12-12-12-12-12-12-12-12-12-12--|
G|-------9-11p9--------------------------------9-11----------------------------------------|
D|-----------------------------------------------------------------------------------------|
A|-----------------------------------------------------------------------------------------|
E|-----------------------------------------------------------------------------------------|