So i just maid a plugin wich will allow you to connect your server to youtube (to allow to play a song from youtube).
so just put the file in your plugin's directory, before you run the server open the file (it will connect to the internet to perform some changes to your server to allow it) and go into your server, type /yt "link to the song" in a command block and just put a pressure plate or so above it. Have fun !!!