Some alert YouTubers noted the similarity between
Super Mario World 2 - Yoshi's Island (SNES) Music - "Star Theme" [YouTube]
and
Bonzo Dog Band - "Keynsham" (words, music and vocals by Neil Innes) [YouTube]
Probably not worth going to court over, especially without Innes' immortal lyrics:
Lipstick gleam
Hexachlorophene
Cling cling the ring
Clang clang she sang
It's tragic magic
There are no coincidences
But sometimes the pattern is more obvious