Post it as ABC
X:1
T:Frere Jacques
M:4/4
L:1/4
K:C
 c d e c| c d e c| e f g2| e f g2| g/2a/2 g/2f/2 e c| g/2a/2 g/2f/2 e c|\
 c G c2| c G c2|

That can be played in numerous apps which many musicians will already be familiar with, and which also display the score. It can be played in web-based tools such as Paul Rosen's simple abcjs player, and Michael Eskin's complex one:

https://editor.drawthedots.com/
https://michaeleskin.com/abctools/abctools.html

Michael's web tool allows you to post the ABC in a link so it can be played:
Frère Jacques

No links to rot. No external players. All browser-based.