Analysis of information sources in references of the Wikipedia article "Best Day of My Life" in English language version.
Best Day of My Life by American Authors: Plays while Katherine (pretending to be Elena) is writing in her doppelganger's diary and rejoicing over how wonderful the world is and how she finally has everything she's ever wanted.
...topped off with Holly's amazing nasal stutter. Quite literally, nothing had ever sounded like this before.
Bowie's stuttered vocals in this song ("Ch-Ch-Changes") are some of the most famous stutters in rock.
It was Elton's idea to stutter the vocal: "B-B-B-Bennie..." Bernie Taupin thought this worked very well with the futuristic, robotic theme of his lyrics.