Difficult to write the life of a musician. Many serious musicians say that everything is in the music. Tim Mitchell's effort is in some ways quite uneven. The early years don't get a huge amount of depth. The last years are really just a list. (I read in the Time Out guide to the Velvet Underground that this title was heavily cut down by the publisher, which may be the case). What's good is that Mitchell is genuinely interested in the music, and that pays off. He's also interviewed more than 25 key people and had the cooperation of Cale himself so there's a lot of detail here you can't get anywhere else. I would start with 'What's Welsh for Zen: Autobiography of John Cale but Cale is good so you need to read this too.