X: Muted, struck string 
x/y: Slide up from x to y 
x\y: Slide down from x to y 

Pennywise is Fletcher Dragge(guitar), Byron McMackin(drums), Jim Lindburg(vocals), and Randy Bradbury(bass).

SIREN INTRO
THEN--------------------------------------------------------------------
                                                                       |
                                                                       -----| 
MAIN RIFF                                                                   |
      4x           1st and 3rd time        2nd time         4th time        |
|---------------|--------------------|------------------|---------------|