Aindrias Hirt's blog

Over a century ago, musicians noticed that European folk music seemed to exhibit certain uniform traits. They tried to analyse the music based upon the vast musical knowledge that they believed they had. The result was that folk music was described as tetratonic (four notes per octave), pentatonic (five notes per octave), or hexatonic (six notes per octave) because the music seemed to be “gapped” in some way.