Nintendo - Super Mario Brothers Tabs

Alright, here's a pretty much perfect tab of Super Mario Brothers for the NES.  I'm pretty proud.  Enjoy.

E|--12-12-12----12--15-----||-----------------------------12--15--17--13--15--12----------------||
B|-----------13------------||*--13------------------------------------------------13--15--12---*||
G|----------------------12-||------12----14-16-15-14--12----------------------------------------||
D|-------------------------||---------14--------------------------------------------------------||
A|-------------------------||*-----------------------------------------------------------------*||
E|-------------------------||-------------------------------------------------------------------||

E||---15-14-13-------------------------------15-14-13--------20-20-20------------|
B||*-----------16-17--------13----13--15--------------16-17----------------------|
G||-------------------13-14----14------------------------------------------------|
D||------------------------------------------------------------------------------|
A||*-----------------------------------------------------------------------------|
E||------------------------------------------------------------------------------|

E|--15-14-13---------------------------------------------||
B|-----------16-17--------13----13--15---16--15--13-----*||
G|------------------13-14----14--------------------------||
D|-------------------------------------------------------||
A|------------------------------------------------------*||
E|-------------------------------------------------------||

E|-------------------12----------------------------12----------|
B|--13-13-13-13--15-----13---------13-13-13-13--15-------------|
G|-------------------------14-12-------------------------------|
D|-------------------------------------------------------------|
A|-------------------------------------------------------------|
E|-------------------------------------------------------------|

E|-------------------12------------12-12-12----12--15----------|
B|--13-13-13-13--15-----13------------------13-----------------|
G|-------------------------14-12-----------------------12------|
D|-------------------------------------------------------------|
A|-------------------------------------------------------------|
E|-------------------------------------------------------------|

E|--12----------------13-13---------17-17-17--15--13-----------|
B|-----13-----------------------12-------------------12--------|
G|--------12-12-13-14-------14--------------------------14-12--|
D|-------------------------------------------------------------|
A|-------------------------------------------------------------|
E|-------------------------------------------------------------|

E|--12----------------13-13---------13-13-13--12---------------|
B|-----13-----------------------12---------------15--13--------|
G|--------12-12-13-14-------14---------------------------------|
D|-------------------------------------------------------------|
A|-------------------------------------------------------------|
E|-------------------------------------------------------------|

UNDERGROUND THEME
E|-------------------------------------------------------------|
B|-------------------------------------------------------------|
G|-------------------------------------------------------------|
D|-------------------------------------------------------------|
A|--1515-1212-1313----1515-1212-1313----88-55-66----88-55-66---|
E|-------------------------------------------------------------|

E|-------------------------------------------------------------|
B|-------------------------------------------------------------|
G|-------------------------------3p2p1-------------------------|
D|------------------------4p3p2--------1-----------------------|
A|--5p4p3p2--5-4-----3-2-----------------5-4-3-2---------------|
E|---------------3-2-------------------------------------------|