File:Whole tone scale on B.PNG - Wikimedia Commons
Chinese Pinyin Lesson 3 | Chinese Tones of Pinyin: 4 Tones & the Neutral Tone | Learn Chinese in Chinatown ™
basicmusictheory.com: A-flat note (Ab)
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basicmusictheory.com: A-flat major scale
On the generalization of tones: A detailed exploration of non-speech auditory perception stimuli | Scientific Reports
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