Hah! Thought of one.
"Comfortably Numb" by the ever-glorious Pink Floyd describes Theoden under the influence of Saruman and Grima. Of course, the extent of his deterioration and helplessness depends on whether you go by the book or movie version of Theodon, but either way it's applicable. Lyrics
hither for those of ye who are unfamiliar with the lovely tune.
I wonder if that's a crime in M-E... RUI: Ruling Under the Influence. Hah. Oh, don't mind me, too much history and a surplus of Supreme Court cases are making me delerious. Four AP American History essays down, one to go. I'm so efficient.