BAND: Theme Songs
 SONG: Mario Bros. Under Ground Theme
 ALBUM: Unknown
 TABBER: EyeBeeDaGee

I tabbed this from the super Nintendo game: Super Mario World.  It may vary a little in some of the games, but this is as close to perfect as I could get it.

Under Ground Theme:

 G|--9--6--7------9--6--7------7--4--5------7--4--5---|
 D|---------------------------------------------------|
 A|-7--4--5------7--4--5------5--2--3------5--2--3----|
 E|---------------------------------------------------|

(Play after every time you do the main part)
 G|---------------------------------------------------|
 D|------------------------0-3-2-0--------------------|
 A|-3-2-1-0--3-2-------0-3---------3-2-0--------------|
 E|--------------1-0-3-------------------3-1-0--------|

It helps a lot if you bust out the good old SuperNes, and listen to the song on super Mario world, or any other game with this theme in it, to get the timings right.

I spent a long time figuring this out.  I think this is as close you can get, but if you find any mistakes, then report them.