QMK song player is a
web app that reads QMK song code and plays it in your browser.
If you have a QMK keyboard with a speaker, you can use the audio
feature to produce these songs from your
keyboard (how to add songs to your
keymap).
Why do this? Because it is fun! You can play a song when the keyboard starts up,
or more functionally, play a little melody to indicate events like when setting
the default layer.
QMK comes with a good number of predefined songs out of the box. Here are a
couple to whet your appetite: