brass instrument vs reed pipe

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). 

reed pipe

noun
  • An organ pipe that is sounded by a vibrating brass strip known as a reed. 

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