I learned most of the Beatles' stuff by watching the release videos on 'Top of the Pops' - there's more than one way of fingering most things (oo-errr!), but the most reliable source is them wot duz it!!

One reason for all the takes is the evolutionary process - instead of rehearsing for ages, then doing a take, the tape was running during the 'rehearsing' so that no gems could slip through.

The 'Anthology' CD's provide a fascinating insight to their creative processes.