ok i write alot of metal songs, but usually just with riffs from a minor scale, and i was wondering what sort of scales are best for songs of this genre.
so any ideas???

aeolian or cmaj are probably the most used
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What kind of metal? Progressive metal songs based in scales such as harmonic or double harmonic minor are always a favorite of mine.

A real challenge for you might be trying to use a standard major scale to create the same heavy dark feeling in a song.
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tbh i try to write lots of different types of metal so im not a 1 trick pony type writer, i want to do more a progressive/dark song so thanks for the idea, will try the thing with the major scale, sounds fun. cheers!!