Immortal Uses BC Rich guitars and Basses and the sound amazing. Heres the tab for Withstand the Fall Of Time off of At The Heart Of Winter.

..  - palm mute          /  - slide up to
   - slide down to      ~  - vibrato
 h  - hammer on          b  - bend
 p  - pull off            Suffixes for bend
                          ph - pinch harmonic
                           f - full bend    h - half bend
*  - see comment           r - release      t - tap bend
X  - percussion mute       ~ - vibrato bend
@  - slight palm mute     () - ghost note, sustained note

 Tune to E

 Withstand The Fall Of Time

 Riff A
|---------------------------------------------------------------------------------|
|---------------------------------------------------------------------------------|
|---------------------------------------------------------------------------------|
|----2222222255555555444444444h5p4p222222200-----222222225555555544444775555444---|
|-2-------------------------------------------2-----------------------------------|
|-0-------------------------------------------0---------------------------------6-|
						a.h.
				  
 Riff B            1,3        2                 4
|-----------------|----------|-----------------|----------|
|-----------------|----------|-----------------|----------|
|-----------------|----------|-----------------|----------|
|-----------------|-33333333-|-3-000-3-000-3p0-|-22220000-|
|-2-----2-----2---|----------|-----------------|----------|
|-0-000-0-000-0-0-|----------|-----------------|----------|
    ...   ...   .

 Sustain
|---------------|
|---------------|
|---------------|
|---------------|
|-2-------------|
|-0-------------|


 Riff C
|------------------------------------------------------------------------------|
|------------------------------------------------------------------------------|
|------------------------------------------------------------------------------|
|------------------------------------------------------------------------------|
|-7-77-7-7-5-55-5-5-4-44-4-4-5-55-5-5-5a.h.7-77-7-7-5-55-5-5-4-44-4-4-5—7-5----|
|-5-55-5-5-3-33-3-3-2-22-2-2-3-33-3-3------5-55-5-5-3-33-3-3-2-22-2-2-3-5-3----|

 Riff D
|----------------------------|
|----------------------------|
|----------------------------|
|---555-333-6----333-555-----|
|---777-555-8----555-777-3/4-|
|-0-----------00---------5/6-|
  .           ..


 Riff E
|---------------------------------------------------------------------------|
|---------------------------------------------------------------------------|
|---------------------------------------------------------------------------|
|---------------------------------------------------------------------------|
|-9--------------7------10--------9----------------9-------10---10-----10---|
|-7-000000000000-5—0000-8----0000-7---000000000000-7--0000--8-00-8--00--8---|
    ............   ....    ....   ............   ....   ..   ..


 Riff F                  1,3       2      4
|-----------------------|---------|------|-------------|
|-----------------------|---------|------|-------------|
|-----------------------|---------|------|-------------|
|---99---11---12---99---|---------|-7777-|-----7-------|
|---77---9----10---77---|-542-542-|-5555-|-----5-8-7-5-|
|-0----0----0----0----0-|---------|------|-000---6-5-3-|
  .    .    .    .    .   ... ...          ...


 Riff G
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|---9"----10"9"7"---9"----10"7"---10"----12"10"9"----10"----12"9"-|
|---7"----7"-7"7"---7"----7"-7"---12"----12"12"12"---12"----12"12"|
|-0---------------0-------------0------------------0--------------|
  .               .             .                  .


 Riff H
|----------------------------------------------------------------------|
|----------------------------------------------------------------------|
|----------------------------------------------------------------------|
|---5-5---5---2-4---5-5---5---4----7-7--7---7-5----7-7---7-8-7-5-7-5-4-|
|----------------------------------------------------------------------|
|-0-----0---0-----0-----0---0----0----0---0-----0------0---------------|


 Riff I
|----------------------------------|
|----------------------------------|
|----------------------------------|
|----4--5--7-7a.h.-----7--5--7-9-7-|
|-2--5--3--5--------2--5--3--5-7-5-|
|-0-----------------0--------------|

 Riff J
|--------------------5----------------------------------5-------8----------|
|----------------------5----------------------------------5-------8--------|
|------------------------7----------------------------------7-------10-----|
|-9------9----9----7-------5-555-4----------9----9----7-------5------------|
|-7-7777-7-77-7-77-5-------3-333-2-2---7777-7-77-7-77-5-------3--------2---|
|----------------------------------0-----------------------------------0---|
    ....   ..   ..                     ....   ..   ..


 Riff K                                     1    2
|-----------------------------------------------|-------|
|-----------------------------------------------|-------|
|-----------------------------------------------|-------|
|-----5-4-----4-----2---------5-4---------------|-------|
|---------5-----5-----3-----------5---------5-5-|-5-5/7-|
|-777-------7-----7-----5-777-------7-33333-3-3-|-3-3/5-|
  ...                     ...         .....


 Riff L
|-----------------------------------------------------------------------|
|-----------------------------------------------------------------------|
|-----------------------------------------------------------------------|
|-----------------------------------------------------------------------|
|-----10-----9------------10----9p5-------8-----7-----------8-----7p3---|
|-777----777---777-10-777---777-----7-555---555---555-8-555---555-----5-|
  ...    ...   ...    ...   ...       ...   ...   ...   ...   ...


 Riff L Continued
|---------------------------|
|---------------------------|
|---------------------------|
|-----4---4------2----5p2---|
|-555555555--33333333-----3-|
|---------------------------|
  .... ...   .... ...