Reddit reviews Tune In: The Beatles - All These Years, Vol. 1

http://www.amazon.com/Tune-In-Beatles-These-Years/dp/1400083052

Tune In is also really good, though it only goes to the end of 1962.

I was going to mention something about this. I've been reading Tune In by Mark Lewisohn (awesome book, btw), and he mentioned that after Paul heard Little Richard's records, he just tried it out one day and found he could emulate his screams and singing fairly well. I don't have the quote at hand, but when asked about technique, he said you just have to let loose and let every ounce of inhibition out of your mind and body.
Since he was practically just out of middle school when he realized he could do it, he would break it out randomly throughout the school day on unsuspecting teachers and friends. So really, he got good/better at it by being a bit of a spaz (i.e., just an energetic youngster) trying to startle people, which I'm sure helped it become something natural and effortless when having to hit those crazy screams later on in life.

As an aside, while trying to find a quote, I happened upon this medley of Beatles screams.

If he's that devoted and he hasn't already read Tune In, then it'll be a welcome Father's Day gift.

https://www.amazon.com/Tune-Beatles-These-Years-Vol/dp/1400083052

Dear Scruffy,
http://www.amazon.com/Tune-In-Beatles-These-Years/dp/1400083052

Tune In by Mark Lewisohn

https://www.amazon.com/Tune-Beatles-These-Years-Vol/dp/1400083052