ghetto blaster vs microphone

ghetto blaster

noun
  • A portable stereo system capable of playing music (from several sources) at a relatively high volume; a boom box. 

microphone

noun
  • A device (transducer) used to convert sound waves into a varying electric current; normally fed into an amplifier and either recorded or transmitted over radio. 

verb
  • To put one or more microphones on or in. 

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