This video is a version of Rick Astley's Never gonna give you up,
except all notes are C.
What does one change in the original compositions to make all notes in a song to be of the same pitch? Do they take relative notes, because I've only heard of relative keys, Eg: A minor being relative to C major.
And if all the notes are the same, wouldn't the song pretty much be a continuous and monotonous pitch? How do such microtonal variations (as seen in the video) arise?