electronic dance music vs two-step

electronic dance music

noun
  • A field of modern popular music, encompassing house, techno and other genres of percussive dance music. 

two-step

noun
  • A piece of music for this dance 

  • A ballroom dance in duple time, having long, sliding steps 

adj
  • Used other than figuratively or idiomatically: see two, step. 

How often have the words electronic dance music and two-step occurred in a corpus of books? (source: Google Ngram Viewer )