There's a little part played for the intro and throughout the song. I'm too lazy to
about whether it's in piano or guitar, cos I can't remember, and I don't have the CD with me 
:P Anyway, listen to the CD to hear which parts it's at:

e: -----------------------------------------------|
B: -3h5-5-3---3-|-3h5-5-3-------|-3h5-5-3---3-5---|
G: ---------5---|---------5-2-5-|---------5-----5-|
D: -----------------------------------------------|
A: -----------------------------------------------|
E: -----------------------------------------------|

C (x32010@1)    G (320003@1)    Am (x02210@1)  FGod (133211@1)be merciful to me on
C (x32010@1)    G (320003@1)    Am (x02210@1)  AmThy (x02210@1)grace, I rest my plea
C (x32010@1)    G (320003@1)    Am (x02210@1)      FPlenteous (133211@1)in compassion Thou
C (x32010@1)      G (320003@1)      Am (x02210@1)     FBlot (133211@1)out my transgressions now


F (133211@1)      G (320003@1)     C (x32010@1)      AmWash (x02210@1)me, make me pure within
F (133211@1)          G (320003@1)                CCleanse, (x32010@1)oh, cleanse me from my sin


C (x32010@1)     G (320003@1)       Am (x02210@1)    FMy (133211@1)transgressions I confess
C (x32010@1)       G (320003@1)      Am (x02210@1)   FGrief (133211@1)and guilt my soul opress
C (x32010@1)    G (320003@1)       Am (x02210@1)     FI (133211@1)have sinned against Thy grace
C (x32010@1)    G (320003@1)        Am (x02210@1)   FAnd (133211@1)provoked Thee to Thy face


F (133211@1)  G (320003@1)      C (x32010@1) G (320003@1)  AmI (x02210@1)confess Thy judgment just
F (133211@1)          G (320003@1)         CSpeechless, (x32010@1)I, Thy mercy trust


C (x32010@1)  G (320003@1)  Am (x02210@1)    FI (133211@1)am evil born in sin
C (x32010@1)     G (320003@1)   Am (x02210@1)      AmThou (x02210@1)desirest truth within
C (x32010@1)    G (320003@1)    Am (x02210@1)   FThou (133211@1)alone my Savior art
C (x32010@1)       G (320003@1)    Am (x02210@1)  AmTeach (x02210@1)Thy wisdom to my heart


F (133211@1)     G (320003@1)       C (x32010@1)   GAm
Make me pure, Thy grace bestow
F (133211@1)     G (320003@1)             CWash (x32010@1)me whiter than the snow


Am (x02210@1)             G (320003@1)   CGracious (x32010@1)God, my heart renew
F (133211@1)        G (320003@1) Gsus4 (3x0013@1)   GMake (320003@1)my spirit right and true
Am (x02210@1)   G (320003@1)      CThy (x32010@1)salvation's joy impart
F (133211@1)  F (133211@1)  F (133211@1)  F (133211@1)F (133211@1) F (133211@1) FSteadfast (133211@1)make my willing heart
Thy salvation's joy impart
F (133211@1)  F (133211@1)  F (133211@1)  F (133211@1)F (133211@1) F (133211@1) FSteadfast (133211@1)make my willing heart

G~


C (x32010@1)     G (320003@1)     Am (x02210@1)   FBroken, (133211@1)humbled to the dust
C (x32010@1)     G (320003@1)      Am (x02210@1)     AmBy (x02210@1)Thy wrath and judgment just
C (x32010@1)    G (320003@1)      Am (x02210@1)    FLet (133211@1)my contrite heart rejoice
C (x32010@1)    G (320003@1)      Am (x02210@1)     AmAnd (x02210@1)in gladness hear Thy voice


F (133211@1)     G (320003@1)       C (x32010@1)  G (320003@1) AmFrom (x02210@1)my sins, oh, hide Thy face
F (133211@1)       G (320003@1)              CBlot (x32010@1)them out in boundless grace