Recurrent themes in their songs (Iron Maiden fans only)

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Iron maiden have often incorporated ideas from other (famous) works in literature ,history and sometimes music. for example : the rhyme pf the ancient mariner (from the classic poem by colridge ) caught somewhere in time (the movie "somewhere in time" and a line in the song(time is always on my side) "borrowed" from the RollingStones ) seventh son of a seventh son (novel) brave new world(novel ,movie) the trooper (from an account of the charge of the light brigade) alexander the great (history) genghis khan (history) to tame a land (originally called "dune" after the famous scifi series by herbert) no more tears (shared a name with a very famous Ozie Osbourne song) Quest for fire (from the name of a documentary/fiction movie about prehistoric people) etc etc etc the list goes on . what is your opinion on this ? # good an artistic review of these works and events from a "METAL" view , bringing some aspects of the culture in these works to METAL fans . # bad they actually milk the sucess of movies,books ,songs by others and appropriate the success after adding some electric riffs !(indeed there have been some plagiarism claims and/or suits ) so which is it ?