Re: that cannot 54)be undone
Some effects on things and on people can be undone, ie they can be reversed. The piece is saying that music makes changes which will always stay in place.
Please check your posts when you have cut and pasted pieces. The formatting is rather messed up - you've lost spaces and those brackets are in very strange positions. Remember to go back and edit posts so that they are readable.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.