Mass vs sextet

Mass

noun
  • A musical composition set to portions of the Mass. 

  • The principal liturgical service of the Church, encompassing both a scripture service (Liturgy of the Word) and a eucharistic service (Liturgy of the Eucharist), which includes the consecration and oblation (offering) of the host and wine. 

  • A similar ceremony offered by a number of Christian churches. 

sextet

noun
  • A composition for six voices or instruments. 

  • Any group of six people or things. 

  • A group of six singers or instrumentalists. 

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