Do I really need to be the one to point out that only one of the 27 songs has a theme that is remotely appropriate for this purpose? ("Hello Goodbye"). The rest are just big Beatles hits...although now that I'm thinking about it, "Let it Be" could work too.
I know I'm a Beatles nerd, but wouldn't "Anytime At All" be the best song to use for a ring tone? The words are: "Anytime at all. All you have to do is call. And I'll be there."
Just a thought.
