From our earliest days in Liverpool, George and I on the one hand and Paul on the other had different musical tastes. Paul preferred 'pop type' music and we preferred what is now called 'underground'. This may have led to arguments, particularly between Paul and George, but the contrast in tastes, I'm sure, did more good than harm, musically speaking, and contributed to our success.

Guilt for being rich, and guilt thinking that perhaps love and peace isn't enough and you have to go and get shot or something.

When you wake up and your heart is going like the clappers or your back feels strained, or you develop some other hang-up, you should let your mind go to the pain and the pain itself will regurgitate the memory which originally caused you to suppress it in your body. In this way the pain goes to the right channel instead of being repressed again, as it is if you take a pill or a bath, saying 'Well, I'll get over it'. Most people channel their pain into God or masturbation or some dream of making it.

Happiness is a good vibe for peace.

There were very few real folk singers you know, though I liked Dominic Behan a bit and there was some good stuff to be heard in Liverpool. Just occasionally you hear very old records on the radio or TV of real workers in Ireland or somewhere singing these songs and the power of them is fantastic.

The more I see the less I know for sure.

Lack of feeling in an emotional sense is responsible for the way some singers do our songs. They don't understand and are too old to grasp the feeling. Beatles are really the only people who can play Beatle music.