brass instrument vs oboe

brass instrument

noun
  • Any musical instrument whose tone is produced by vibration of the lips as the player blows into a mouthpiece (or tubular resonator). 

oboe

noun
  • A soprano and melody wind instrument in the modern orchestra and wind ensemble. It is a smaller instrument and generally made of grenadilla wood. It is a member of the double reed family. 

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