Definition
Medieval modes, also known as church modes or Gregorian modes, are a collection of scales predating the major and minor key system in Western music. Each mode has a unique melodic characteristic, stemming from the arrangement of whole and half steps. They lend music a distinct, somewhat archaic sound. Consider them the building blocks upon which early Western music was based. Each mode creates a different emotional feel. It's like choosing a different filter to give an old-time feel to a modern photo 📸.