Following are some guitar chords that work fairly well:

    Am        G    Am
  O Senor Don Gato was a cat.
     Am         G        Am
  On a high red roof Don Gato sat.
          E                                  Dm
  He went there to read a letter, Meow, Meow Meow.
            Dm                        G         Am
  Where the reading light was better, M.., M.., M..
         E         Dm      G Am
  Twas a love note for Don Gato

Hopefully, it kinda lines up this time. (It looks fine when I'm typing it in.) If not, SOMEBODY should consider an evenly spaced font for the message board itself! (hint, hint...)

While this is in the same key as the Noteworthy file I sent, I don't know (not that it matters so much) if that's actually the key I learned it in. The intervals, at least, are correct.

Think spanish guitar, and put a nice little flamenco-y flourish on the end of the first two lines. Have fun! =)