"Thinking Tune" is track 13 of the album Arthur and Friends: The First Almost Real Not Live CD (or Tape). It is not actually a song, but is instead The Brain making noises of thinking set to music.
Lyrics[]
I, the Brain, will now engage in my favorite entertainment.
I like to think.
Hmm. Aha
Huh.
Mm-hmm.
Hmm.
Hm-hmm.
Ah. I like to think.
Hmm.
Mm-hmm.
Ahhh. That was very satisfying.