si vs te

si

noun
  • A syllable used in solfège to represent the seventh note of a major scale. 

te

noun
  • In solfège, the lowered seventh note of a major scale (the note B-flat in the fixed-do system): ta. 

  • The name of the Cyrillic script letter Т / т. 

How often have the words si and te occurred in a corpus of books? (source: Google Ngram Viewer )