Brilliant! You REALLY need to get that info over to someone who
  can fix the way that Chinese is considered in English countries
  because our bias is showing and I never saw it 'til you pointed
  it out just there. After all, what makes their "intonations" any
  stranger than our "vowels"? Nothing. They're the same. " Way
  back when I was studying Chinese, we were taught that
  intonations were relevant to the dialect, and might change the
  meaning of an utterance with similar pronunciation from that
  language. Back to English.
  We are, or at least I was, taught that the vowel is 'a, e, i, o,
  u,' and sometimes 'y'. Question: What makes a vowel a vowel, if
  not intonations? Reverse culture shock!"* - not me
  *