How Nintendo HIDES secret melodies in their music

It's time for another round of Nintendo music easter eggs and secrets!
• Which two Mario Kart songs share the same melody - one in a minor key and one in major?
• Which Super Smash Bros song sounds the same forwards and backwards?
• Why doesn't Boo's voice sound like it used to?
• Which 2 Zelda songs have hidden, backwards melodies?

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Thanks to Joshua Taipale for allowing me to use the video of the "doo" sound, and for providing more info about the sound's origin!

Check out Joshua's Twitter page:   / atelierjoshua  


SOURCES
Mario Strikers Charged
https://www.mariowiki.com/Mario_Strik...
Boo voice
https://web.archive.org/web/200703220... Inagaki interview
https://web.archive.org/web/201210270... Sanae Uchida interview 1
https://web.archive.org/web/200707031... Sanae Uchida interview 2
https://www.ign.com/articles/2004/12/... Camelot interview
Super Mario Bros Wonder
  / 1671689022723293186   Joshua Taipale’s tweet
https://www.spectrasonics.net/product... Omnisphere website
https://www.spectrasonics.net/product... Vocal Planet website

Some game footage via World of Longplays, LongplayArchive