national anthems, specifically american

why do performers feel the need to embellish the national anthem? there is a right way to sing it. it's called following what was written and what has been the national anthem for eternity. i am not condemning changing the key: i personally don't think you should sing it where it was written if you can't do it well.

but adding riffs and just doing things to the song that should not be done? unacceptable. follow the damn sheet music. find it on the internet if you don't know how it should go. do you stick riffs into the middle of classic hymns? no. not at all. doing it to the star-spangled banner is unacceptable. YES DAMMIT R&B ARTISTS I AM TALKING TO YOU ALL. STOP COMMITTING MUSICAL CRIMES AGAINST HUMANITY.