<< When you talk about picking up ideas from billboards, TV spots, posters, etc., you are making reference to some advertising principles that quickly become quite deep;
especially in areas of big ticket sales and political persuasion. Why should composers be left out? >>

The principles behind a billboard or poster or other media I referenced may or may not influence a song or lyrical idea of a songwriter. I'm not sure what you mean by composers being "left out" because in the example you give that "if we are at war with a country, you wouldn't want to write a song about what a beautiful place it is.", were I perhaps a left leaning anti war activist songwriter, I may actually would use the beauty of that country as a platform for anti war protest in a song...

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