Listening to music with MacBooks lid closed
Your MacBook will normally always go to sleep when you close the lid, and that unfortunately will stop the music playing.

But there is a way to stop your Mac from going to sleep when you close the lid with a simple shell command.

Disable sleeping when lid is closed:

sudo pmset -a disablesleep 1


Re-enable sleeping when lid is closed:

sudo pmset -a disablesleep 0