Guitar tablature is easily converted into actual notes, it just takes time.
Tabs are set up like this:
e|---0-1-----
B|-------1---
G|-------2---
D|-------2-3-
A|-------0---
E|-----------
Each line corresponds to a string on the guitar, from highest at the top to lowest. The letter is the note name that the string is tuned to, and the number is the fret that you play on that string; frets move up by semi-tones. A 0 means open-string, so a 0 on the G string is a G. Therefore a 1 on a G string is a G# and a 2 is an A, or a 12 on a D string is still a D but an octave up. Tab moves left-to-right, so it tells you the order to play the notes - multiple notes listed vertically means those are all played at once. So the example above is "E note, F note, Am chord, lower F note." If you see an 'h' or 'p' between notes, it basically just translates to 'really smooth transition.'
If you know the notes you should be easily capable of playing piano with a transposed guitar piece. If you don't want to take the time to transpose it all yourself, just plug the tab into a program like
Power Tab by typing in the numbers and it'll show you the transposed notes above in proper musical style.
I don't have a link to Toady's tabs offhand, but I know he's posted them in DF General Discussion before. You shouldn't have too much trouble finding them. Gotcha!
http://www.bay12games.com/forum/index.php?topic=651.0Huh, looks like someone already did this for one track:
http://www.easy-share.com/1909505795/title%20song%20-%20page%201.jpg