Aguilera changed the words in the song's fourth line, which reads as: "O'er the ramparts we watched were so gallantly streaming?" Instead, the "Burlesque" singer merged the lyrics with the song's second line, which she had just sang ("What so proudly we hailed at the twilight's last gleaming?"), belting out: "What so proudly we watched at the twilight's last gleaming?"I have a problem with how she sung it! WTF? She just did too much with her strained vocals. I was like, JUST SING THE DAMN SONG ALREADY! That was pretty disrespectful. I mean, it';s one thing to put a little bit of yourself into the song when singing it, but to damn near recreate the whole melody is unacceptable!
Additionally, Aguilera's voice strained to hit the final note of the song, penned by Francis Scott Key.