function playSong(id) {
  // Challenge: Add code here to make the youtube player play the new YouTube song
  
  //iframe id:
  const player = document.getElementById("player")
  //new yt video source with new id:
  const newSrc = `https://www.youtube.com/embed/${id}?autoplay=1`
  console.log(id)
  //set the src attribute of the iframe to play the new video
  player.src = newSrc
}