I think one of the things about writing in the studio is that the song hasn't matured, if you like, so quite often the vocals are early attempts. Whereas once you've taken it out on the road a bit, you learn more about a song.
“In the present state of our knowledge, it would be useless to attempt to speculate on the remote cause of the electrical energy... its relation to chemical affinity is, however, sufficiently evident. May it not be identical with it, and an essential property of matter?”