Artificial intelligent assistant

properchant

ˈproperˌchant Mus. Obs.
  [f. proper a. + chant n.]
  Applied to those hexachords which began on the note C (nearly corresponding to the modern ‘natural scale’).

1597 Morley Introd. Mus. 4 What is Properchant?.. It is a propertie of singing, wherein you may sing either fa or mi in ♭ fa {sharp} mi according as it shall be marked ♭ or thus {sharp} and is when the vt is in C fa vt. 1667 C. Simpson Compend. Pract. Mus. 112 From these six Notes, Vt, Re, Mi, Fa, Sol, La, did arise three properties of Singing; which they [Latins] named B Quarre, B Molle, and Properchant or Naturall. Ibid. 113 Properchant was when their Vt was applyed to C... But in our Modern Musick, we acknowledge no such thing as Properchant.

Oxford English Dictionary

yu7NTAkq2jTfdvEzudIdQgChiKuccveC e230a97ea2f33f6ace4cfe2c831c7ace