Songs in italics are instrumentals. Songs in boldface are covers. I do not list all musicians who participated in the sessions, but the important ones are there.
A song is only listed at the session where it was introduced. Many of the songs that were left in the can and released some time later received a number of overdubs at later sessions. This is not indicated. Also, only those demos that were never "properly" recorded are listed. For example, there were a number of demos made of "Dress me up as a robber". However, as there is a "real" recording of this, made during the "War" sessions, those demos are not listed.
I also want to point out that just because a session is titled "Demo session", it doesn't mean that all the songs featured are demos. Most of them are, but there may be proper studio versions also. The opposite is also true, i.e. there may be some demos listed under a "proper" session.
This sessionography is as I said just an overview. If you're looking for a more detailed description of Paul McCartney's studio sessions, go to The McCartney Recording Sessions, maintained by Chris Brewer. His site is one of my main information sources.
Follow the links below to get to the sessions:
The 70s sessions
The 80s sessions
The 90s sessions