Hemoglobin Highway

The song Hemoglobin Highway is played in Journey to the Center of Candace when Phineas tells Ferb to turn on some road music.

Lyrics
Just the two of us, In an esophagus, It's time to get this mission rollin'.

Don't want to make a fuss, But that was the Pancreas, Look down before we reach the colon.

On a Hemoglobin Highway, In a mini submarine,

If your going my way, You'll see what I mean, And I left at the spleen.