harmonizer

noun2

1. •
   One who harmonizes or brings harmony.
2. •
   An electronic pitch shift effect where the shifted version is played alongside the original in harmony.

noun1

1. •
   (slang) A fan of the American girl group Fifth Harmony.

   • And the misses are still movin’ on! Look out, Harmonizers – they might be coming to a town near you! — 2013