Mario 2 overworld melody for Micro:bit MakeCode. I have confirmed that the pitches of all notes are correct. Some duration of long notes may need adjustment.

microbit_mario2_overworld.ts

const mario2Start: string[] = [
    "g5:4","f#:8","f:4","d:8","b4:4","a:8","g#:4","g:12","g5","g4:18","r:6",
]
const mario2Body: string[] = [
    "g5:8","c:4","e:8","g:12","c:4","e:8","g:4","b4","eb5","g","b:8","a:24","r:4",
    "g5:8","bb4:4","d5:8","g:12","bb4:4","d5:8","g:4","c#","e","g","b:8","a:20","r:4",
    "b:4","c6:8","b5:4","c6:8","a5:12","c6:4","b5:8","a:4","g:8","f#:4","g:8","e:12",
    "c#:4","d:8","e:4","f:8","e:4","f:8","b4:12","e5:4","d:8","c:28","r:24",
    "r:8","e5:16","g:12","a:8","c6:28","a5:8","g:4","e:8","c:4",
    "d:8","e:4","d:8","e:4","d:8","a4:8","r:4","d5:16",
    "a4:2","d5","a4","d5","a4","d5","a4","d5","a4","d5","a4","d5:4","r:10",
    "d:12","e:4","d:8","e:4","d:8","e:4","r:8","a:12","g:4","a:8","g:4","e:8","d:4","c:8","e:16",
    "g4:2","e5","g4","e5","g4","e5","g4","e5","g4","e5","g4","e5:4","r:10",
    "r:8","g","d","b4","a","g",
    "r:8","e5:16","g:12","a:8","c6:28","a5:8","g:4","e:8","c:4",
    "d:8","e:4","d:8","e:4","d:8","a4:8","r:4","d5:16",
    "a4:2","d5","a4","d5","a4","d5","a4","d5","a4","d5","a4","d5:4","r:10",
    "d:12","e:4","d:8","e:4","d:8","e:4","r:8","a:12","g:4","a:8","g:4","a:8","g:4","e:8","c:16",
    "r:8","f#4:4","g:8","g#:4","a:8","c5:12","r:12","c:16","r:12",
    "e5:8","f:4","d#:8","e:4","f:8","d#:4","e:8","b:16","g#:12","f","e",
    "d:3","e","d","c","b4:8","c5:4","d:8","c:4","b4:8","c5:16","r:8","c:4","b4:12","c5",
    "r:8","d:16","c#:12","d:8","a:16","f#:12","g","a",
    "b5:8","a#4:4","b:8","b5:4","a:8","g#4:4","a:8","a5:4","ab:8","g4:4","ab:8","ab5:4","g:8","d:4","b4:8","g:4"
]
music.setTempo(192 * 3)
music.startMelody(mario2Start, MelodyOptions.OnceInBackground)
music.onEvent(MusicEvent.BackgroundMelodyEnded, function () {
    music.startMelody(mario2Body, MelodyOptions.OnceInBackground)
})

MicroPython version:

from microbit import *
import music

music.set_tempo(bpm = 192 * 3)

music.play(["g5:4","f#:8","f:4","d:8","b4:4","a:8","g#:4","g:12","g5","g4:18","r:6"])

mario = [
    "g5:8","c:4","e:8","g:12","c:4","e:8","g:4","b4","eb5","g","b:8","a:24","r:4",
    "g5:8","bb4:4","d5:8","g:12","bb4:4","d5:8","g:4","c#","e","g","b:8","a:20","r:4",
    "b:4","c6:8","b5:4","c6:8","a5:12","c6:4","b5:8","a:4","g:8","f#:4","g:8","e:12",
    "c#:4","d:8","e:4","f:8","e:4","f:8","b4:12","e5:4","d:8","c:28","r:24",
    "r:8","e5:16","g:12","a:8","c6:28","a5:8","g:4","e:8","c:4",
    "d:8","e:4","d:8","e:4","d:8","a4:8","r:4","d5:16",
    "a4:2","d5","a4","d5","a4","d5","a4","d5","a4","d5","a4","d5:4","r:10",
    "d:12","e:4","d:8","e:4","d:8","e:4","r:8","a:12","g:4","a:8","g:4","e:8","d:4","c:8","e:16",
    "g4:2","e5","g4","e5","g4","e5","g4","e5","g4","e5","g4","e5:4","r:10",
    "r:8","g","d","b4","a","g",
    "r:8","e5:16","g:12","a:8","c6:28","a5:8","g:4","e:8","c:4",
    "d:8","e:4","d:8","e:4","d:8","a4:8","r:4","d5:16",
    "a4:2","d5","a4","d5","a4","d5","a4","d5","a4","d5","a4","d5:4","r:10",
    "d:12","e:4","d:8","e:4","d:8","e:4","r:8","a:12","g:4","a:8","g:4","a:8","g:4","e:8","c:16",
    "r:8","f#4:4","g:8","g#:4","a:8","c5:12","r:12","c:16","r:12",
    "e5:8","f:4","d#:8","e:4","f:8","d#:4","e:8","b:16","g#:12","f","e",
    "d:3","e","d","c","b4:8","c5:4","d:8","c:4","b4:8","c5:16","r:8","c:4","b4:12","c5",
    "r:8","d:16","c#:12","d:8","a:16","f#:12","g","a",
    "b5:8","a#4:4","b:8","b5:4","a:8","g#4:4","a:8","a5:4","ab:8","g4:4","ab:8","ab5:4","g:8","d:4","b4:8","g:4"
]

music.play(mario, wait = False, loop = True)

while True:
    if button_a.was_pressed():
         music.stop()

This is awesome. Would you be able to make a bassline to it too, so we could use two microbits at once to make it the full theme? And they could start over a radio signal too