Gig Savers: Harmonica Microphones The Gig Savers™ series has been designed to give studying harmonica players answers to common questions in a brief, affordable, yet informative fashion. Harmonica Microphones is the first published book to specifically cover harmonica microphones and their usage. Subjects covered are: popular microphone models, bodies, elements, accessories, interchangeability and customization, and how they are used and matched with an amplifier.