Lazy writing! There is a verse missing at the end!
9/17/2012 11:09:19 AMOn the last page, instead of writing the last verse (which is sung differently from the others) the arranger just wrote a repeating loop with the words "(Vocal ad lib.)" instead of writing out the lyrics. There is nothing ad libbed here. Who ever wrote out the music appears to have run out of time or desire to finish it!!