Assertion: clavichord's note | /r/HasProperty | sung to unacceptable degree
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Source sentences:
text: Prior to the advent of the charismatic Rubini, every well-schooled opera singer had avoided using a conspicuous and continuous vibrato because, according to Scott, it varied the pitch of the note being sung to an unacceptable degree and it was considered to be an artificial contrivance arising from inadequate breath control.