I have a few "standards" for the shower. "Roland" is a big favorite ("The fairest flower of chivalry to bloom in all the land") followed by, oddly enough, "Last Saskatchewan Pirate." On some days, it's the Leslie Fish version of "The Quest" (The knight came home from the quest").
I often use songs when I am cooking to manage timing, particularly if (as is frequently the case Friday afternoon) I am cooking multiple dishes. Song selection has a lot to do with when I need to switch attention from one dish to another. It's a method for managing cooking up to five things simultaneously that I have discovered works reasonably well.