I agree with Ivanhenares.com, Martin shouldn't changed the notes of the National Anthem, specially in the last line, where he changed it into higher note.
He should ask a public apology.
We know that Martin lived in America for a couple of months before to find his singing career there, but unfortunately he didn't succeed. Is this his reason why he changed the note into higher just to WOW and AMAZE the people there? Hmmm...
