How far are you into the game? How did you even get the soundtrack? Did you get a TAS to play the game? Record yourself playing it and play that back or something else.
All are extended audios on YouTube, just made a playlist with them all in.. those were the days hehe.
Go to the home menu, press on your icon thing in the top left go to "profile" and between the list of games and your icon + name there should be a string of numbers starting with "SW" (eg. SW-1234-5678-910-1112) that's your friend code. PS, You need to have paid for nintendo switch online and have a nintendo account linked to your switch account.
Mario Kart Wii was the best Mario Kart and nobody can change my mind. I used to love Super Mario 64 but I had it on an R4 card that eventually broke :C. I spent half of my childhood playing Mario & Sonic at the Olympic Games & Mario & Sonic at the Olympic Winter Games. I also currently have the Tokyo 2020 version on Switch. I had this Mario Basketball game and it was an amazing game but I can't remember it's name. (Mario Hoops maybe?)