Why does Mario music sound "Fun"?

In one of my most ramble-y videos ever I look at what makes Mario music sound so distinctly like Mario music.

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Footage used from:

Wynton Marsalis Septet plays Happy Birthday: https://www.youtube.com/watch?v=bYi5hJR7O7Y

We Are The City - Happy New Year: https://www.youtube.com/watch?v=qmh4eIhjIYk

GWAR - Let Us Slay:
https://www.youtube.com/watch?v=2NzA4XLjRaM

Vulfpeck - Daddy, He Got A Tesla:
https://www.youtube.com/watch?v=8DRCGcuByQc

Видео Why does Mario music sound "Fun"? канала 8-bit Music Theory