Micro:bit 

Here's a video introducing how to create an algorithm in order to play 'Yma o Hyd' using Make Code's online tools. The song can be transferred from the Make Code tools to the Micro:bit if you want (but you don't have to). After completing the task you can try following the same process to create an algorithm to play 'Zombie Nation' and also 'Hen Wlad fy Nhadau'.
'Zombie Nation' musical notes
Hen Wlad fy Nhadau musical notes