Song: The Siren
Band: Nightwish
Album: Once 
Bassist: Marco Hietala
Composer: T.Holopainen, E. Vuorinen
Tabbed by: FLBatista
Tunning: Down 1 step (DGFC)

PS.:I took this video with reference is to the bottom clearer : https://www.youtube.com/watch?v=jnIOu_ZpR90

MAIN RIFF:

F|---------------------------------|
C|---------------------------------|
G|---------------------------------|
D|-3-3-xx1h3-1h3-xx3-3-xx1h3-1h3-1-|

F|----------------------------------------|
C|----------------------------------------|
G|----------------------------------------|
D|-3-xxxx8\3-3-3-1-3-3-3-xx3-3-xx1-3-331--|
           . . .   . .   

F|---------------------------------|
C|---------------------------------|
G|---------------------------------|
D|-3-3-xx8\3-3-3-xx3-3-3-1h3-1h3-1-|

F|----------------------------------------|
C|----------------------------------------|
G|----------------------------------------|
D|-3-3-3-1h3-3-3-1h3-1h3-1h3-1h3-1h3-331--|


RIFF:

F|------------------|
C|------------------|
G|------------------|
D|-333-3-3-333-4314-|

F|------------------|
C|------------------|
G|---------------5--|
D|-333-3-333-3-33-4-|

F|------------------|
C|------------------|
G|------------------|
D|-333-3-3-333-4314-|

F|-----------------|
C|-----------------|
G|-----------------|
D|-333-3-333-333-3-|


VERSE:

F|----------------------------------------|x2
C|----------------------------------------|
G|----------------------------------3-5---|
D|-3-3~---x-3-3~---3-3~---x-3-x-3-3-----4-|

F|----------------------------------------------------|
C|-------------------------------5\-------------------|
G|-----------------3----------------------------3-5---|
D|-3-3~---x-3-3--3---1-4-3-3---x------x-3-x-3-3-----4-|

F|----------------------------------------------------|
C|-------------------------------5\-------------------|
G|-----------------3----------------------------3-5---|
D|-3-3~---x-3-3--3---1-4-3-3---x------x-3-x-3-3-----3-|


CHORUS:

F|-------------------/5-5-5\-|
C|---------------------------|
G|-------------3(x12)--------|
D|-4(x8)-1(x8)---------------|

F|---------------------------------------------------|
C|-------------------------------5-------------------|
G|-------------3(x12)----3-5-6-6---6(x5)-8(x8)-3(x8)-|
D|-4(x8)-1(x8)---------3-----------------------------|

F|----------------------------------------------------------|
C|------------------------------3-------------1-0-----------|
G|-3---3-------------6----------------1-3---3-----3-1-------|
D|---------3-4---4-4---4--1---1---1-4-------------------4---|


MAIN RIFF:

F|---------------------------------|
C|---------------------------------|
G|---------------------------------|
D|-3-3-xx1h3-1h3-xx3-3-xx1h3-1h3-1-|

F|----------------------------------------|
C|----------------------------------------|
G|----------------------------------------|
D|-3-xxxx8\3-3-3-1-3-3-3-xx3-3-xx1-3-331--|
           . . .   . .

F|---------------------------------|
C|---------------------------------|
G|---------------------------------|
D|-3-3-xx1h3-1h3-xx3-3-3-1h3-1h3-1-|

F|-------------------------444555-----------|
C|---------------------6655------6665553----|
G|--------------------------------------656-|
D|-3-3-xx8\3-3-3-1-3-3----------------------|


VIOLIN SOLO:

F|---------------------------|
C|---------------------------|
G|---------------------------|
D|-0--0--0--0--0--0-----1--1-|
   .  .  .  .  .  .     .

F|---------------------------|
C|---------------------------|
G|---------------------------|
D|-0--0--0--0--0--0-----0--0-|
   .  .  .  .  .  .     .

F|--------------------------------------------------------|
C|--------------------------------------------------------|
G|---------------------------5----------------------------|
D|-3--3--3--143143--3--3--133-43--3--3--143143--3--3-3-1--|
   .  .  .       .  .  .       .  .  .       .  .

F|---------------------------------|
C|---------------------------------|
G|---------------------------------|
D|-000-000-000-00000-00000-000-0-0-|

F|---------------------------------|
C|---------------------------------|
G|---------------------------------|
D|-000-000-000-00000-00000-000-0-0-|

F|---------------------------------|
C|---------------------------------|
G|---------------------------------|
D|-333-333-333-4314333-333-333-3-3-|

F|----------------------------------------|
C|----------------------------------------|
G|------------------------5b(6)-531-------|
D|-333-333-333-33333-3-333---------43143~-|


SIREN SING:

F|------------------------|
C|-----------------/5(x8)-|
G|------------------------|
D|-3~---3~---3(64x)-------|


LAST CHORUS:

F|----------------------------|
C|----------------------------|
G|-------------------3(x15)---|
D|-3-334-4---4\1(x8)--------3-|

F|------------------------------------------------|
C|--------------------------------3(x8)-----------|
G|-------------3(x13)---3-5-6(x8)---------1-3(x8)-|
D|-4(x8)-1(x8)--------3-----------------4---------|

F|-------------------------------------------------------3-5---------|
C|------------------------------------------3-------/5-6-------------|
G|-3-333-3-333-1--------3--1-------------3----3---3----------1-------|
D|----------------4---4-------4-1---1-4--------------------------4---|
 

LEG:

 / : Slide Up
 \ : Slide Down
 h : Hammer On
 p : Pull Off
 ~ : Let Ring
 . : Staccato
 b(x): Bend to x
 x : Percussive