downbeat vs metre

downbeat

noun
  • The accented beat at the beginning of a bar (indicated by a conductor with a downward stroke). 

adj
  • Cautiously optimistic. 

  • Sad or pessimistic. 

metre

noun
  • The rhythm or measure in verse and musical composition. 

  • The basic unit of length in the International System of Units (SI: Système International d'Unités), equal to the distance travelled by light in a vacuum in 1/299 792 458 seconds. The metre is equal to 39+⁴⁷⁄₁₂₇ (approximately 39.37) imperial inches. 

verb
  • To put into metrical form. 

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