section_path: Classification/Hornbostel–Sachs
section_name: Hornbostel–Sachs
paragraph_text: Hornbostel–Sachs
  
  Erich von Hornbostel and Curt Sachs adopted Mahillon's scheme and published an extensive new scheme for classification in Zeitschrift für Ethnologie in 1914. Hornbostel and Sachs used most of Mahillon's system, but replaced the term autophone with idiophone.
  
  The original Hornbostel–Sachs system classified instruments into four main groups:
  
  Sachs later added a fifth category, electrophones, such as theremins, which produce sound by electronic means. Within each category are many subgroups. The system has been criticised and revised over the years, but remains widely used by ethnomusicologists and organologists.