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Harmony guitar parts...
I've been on the guitar world website ( www.guitarworld.com ) and had a look at marty friedmans lesson pages on harmony parts, and they're really cool. But there is a problem- one is missing! The pages on who uses and how to use the "Iron Maiden Formula" ( ie; 3 notes of the same scale up),parallel forths and the "spider run system" but the pages on parallel octaves and parallel fifths are missing! If anyone knows what was on those pages or has them ( eg- has the mag with them in, etc) PLEASE post them on this page or if you know ANYTHING about what might have been on those pages or about how to or who uses parallel octaves or parallel fifths in 2 or 3 guitar harmony parts then could you please post them. :-) As well as this, if you know anything about harmony parts between guitars ( and they don't have to be cheesy, they can be subtle.) then please feel free to post them.
Also, as a brief extra question, when do you use the natural, harmonic and melodic minors? What kind of sound and atmosphere do they create?
There are numerous method for creating harmony line in music.
From the simple (thirds or sixths) to the complex, contrpuntal harmony like Bach's Inventions and Fugues.
If this is really interesting to you you should get a book on Voice leading for 4 parts. You can learn a great deal from this.
The simple methods are to just take an existing line and parallel the harmony in diatonic thirds or sixths. This doesn't always work depending on the implied chord progression you are playing over.
Understanding the chord progressions and retrogressions are the real key to this. You will need to study for a while to make these connections but it will be well worth it in terms of your ability to arrange and compose.