no kidding.
As a singer, I just cringe everytime I hear someone take liberty with the melody of our anthem. Arrangements that still remain true to the song itself I don't have much issue with, but when you change it up to make it "your own" you do a disrespect to Francis Scott Key, and to the general public.
A few months ago someone here in Dallas sang the anthem at some function. She took the stage and immediately burst into her own "rewritten lyrics". She was booed quite audibly (and rightfully so) for her lack of respect.