What did Scrooge think about when he heard the harp music?

From the text:

When this strain of music sounded, all the things that Ghost had shown him, came upon his mind; he softened more and more; and thought that if he could have listened to it often, years ago, he might have cultivated the kindnesses of life for his own happiness with his own hands, without resorting to the sexton’s spade that buried Jacob Marley.