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Will we ran out of new Music?
You can just keep adding a note to any existing song and call it a new song. There is no limit to how long a song can be so no we can't.
Taking a life in order to save a thousand lives is morally and ethically acceptable
This depends on the 1 person getting killed and the 1000 people getting killed. If either of these groups are bad people, then it changes a lot.