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I wonder if it is a matter of association with received speech intonation? Eastern music, associated with tonal languages, uses completely different scales, and Klezmer, which sits somewhere between blues (mournful but generally in major keys) and Arabic (lots of minor intervals) is usually very jolly.Perhaps it's a question of frequency ratios. The eventempered major scale approximates to rational intervals and the chords contain mostly even harmonics. Odd harmonics sum to a sawtooth waveform which is more "attention grabbing" - whether you associate this with a baby's cry or a call to dance depends on culture rather than physiology.