Kate Higgins seems to be the singer on the Super Mario Odyssey theme song

Wondering who's behind the voice of Pauline in Super Mario Odyssey? The MP3 version of the song over on the official website is tagged with the name Kate Davis. After a bit of snooping on that name, Wikipedia gives us more info.

Catherine Davis "Kate" Higgins (born August 16, 1969), also known as Kate Davis, is an American voice actress, singer, and jazz pianist. Her major voice roles have been in English-language adaptations of Japanese anime, and she is best known as the voice of Sakura Haruno in Naruto. She has also voiced C.C. in Code Geass and Saber in the original Fate/stay Night. In 2010, she voiced Miles "Tails" Prower in the video game series Sonic the Hedgehog. She also voices Kate, Stinky and Lilly in the Alpha and Omega sequels. In 2014, She became the voice of Ami Mizuno / Sailor Mercury in the Viz English dub of Sailor Moon.

In other words, the voice of Pauline is also the voice of Sakura and Tails. What a crazy world we live in!