Pop music, which I deeply admire and wish I could play better than I can, is based on expressing one mood, one feeling at a time. Classical music is by its very nature involved with different kinds of music, constantly transforming one another, which is more akin to the way our experience of life really is.
In your occupations, try to possess your soul in peace. It is not a good plan to be in haste to perform any action that it may be sooner over. On the contrary, you should accustom yourself to do whatever you have to do with tranquility, in order that you may retain the possession of yourself and of settled peace.