Hello Goodbye: Those videos are wonderful reminders of the spellbinding excitement of Beatlemania. Also, I have noted the "money" theme that unifies the songs.
I saw that John wasn't singing into the mike on CBML but he was singing nonetheless. This leads me to believe that the Beatles were very conscious and deliberate about who sang what songs and what harmonies they participated in. They really seemed to know what vocal combinations served the best effect and affect for a song.
Thanks for posting.