There are no words that will bring you peace of mind right now. I know because I have gone through it with both parents now. I love that you dad gave you the song to let you know that he is going to be okay with transitioning from here to the stars above. It is always harder for those left behind but right now enjoy all the time you have left together. One day you will look back on all your memories and actually smile. Right now though I am crying with you. Much love and hugs from afar.