What do you think, why some intervals (2/3, 3/4, 4/5 ..) are feeling "harmonic" or consonant, but other like tritone (45/32) are dissonant? What is the physiological reason and why humans had got this ability? It is strange that 2/3 sounds better than 45/32. Sometimes tritone is played could be very cool for me.
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On the level of vibrations, it has to do mainly with Phi and the way our ear interprets the mathematical relationships between those frequencies. On a psychological level, who knows why we really find one chord more 'pleasant' than another. Of course this can differ between people - I'm also a fan of dissonance a lot of the time!