I think that something written in octaves CAN be a very difficult part (usually because it's a duet which has been written in a test piece). But the basic concept of two instruments playing at their natural levels in octaves with each other is much less dangerous and much easier to play musically than two instruments playing in unison. This is down to intonation issues, tonality, harmonics etc. basically it's easier to keep in tune, and differing tones and styles can potentially work as an advantage musically. The advantage of unison to the players is that neither of them feels as exposed, but I would say this would only ever be an advantage if musicality is not among the players strong points!



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