The controls:

/find someband
-Searches for and plays the song you enter
/play
-Starts the song if paused
/stop
-Stops the song
/copyurl
-Copies the song's URL into the clipboard
/sendsong
-Sends the song you're playing to your friend
/downloadsong
-Downloads the song

Oh and If you and your friend both have the script and one of you clicks Send Song there should be a toast and if you click it, the sent song will play.

If you find any bugs or wanna suggest some things reply to this thread.

Thanks!