when writing for an orchestra can we use parallel fifth (Power Chord)? for example in game of thrones symphony for some part of string or another song for brass section because it is so powerful and shiny with P5 interval..
closed as primarily opinion-based by Carl Witthoft, Richard, MattPutnam, ttw, Neil Meyer Mar 15 '18 at 12:25
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There was a time when blues notes were far more than frowned upon. The tritone earned the name 'Devil's interval', and was banned from use. That was then. Now is now.
Parallel fifths, etc., came under the same sort of banner, for wont of a better term! At the time, it was deemed that they weren't attractive, and probably rightly so, then. Now being now, our ears are in a different era, and we are used to hearing hitherto 'unorthodox' sounds. Such as...
No-one in the rocky guitar world will think badly of a player using parallel fifths - in fact, it's sort of sought after. So, if one wishes to use such things, and one feels that it sounds more effective, one really ought to write them in!
Of course you can! And you can in any other sort of music too - piano solo, string quartet, brass band...
The only place parallel 5ths are 'against the rules' is in a particular style of harmony epitomised by Bach's chorale settings. A rich texture is achieved by having the voices do DIFFERENT things. When two parts lock together in parallel 5ths or octaves they stand out too much and spoil the texture. That's all.