A silly little snippet you could use with the microbit and an external speaker to make someone think there's an old Nokia mobile phone ringing somewhere in the room.

from microbit import *
import music

ringtone = [ 
    "e7:1", "d", "f#6", "g#",  
    "c#7:1", "b6", "d", "e",  
    "b", "a", "c#6", "e",  
    "a:4", "R:4"
] 

music.set_tempo(bpm=60)

for repeat in range(2):
  music.play(ringtone)