Whether using the CAGED method, Three-Notes-Per-String, or Berklee method on guitar, it is helpful to understand the concept of a scale. What is a scale, exactly? A scale is a sequence of tones arranged in ascending or descending order by pitch. A pitch is a set of frequencies or wavelengths. Thus, a scale is a series of specific frequencies. When we assign letter names to this series, we get a musical alphabet. In music, we label tones with the letters A through G as well as the symbols ♯ (sharp), ♭ (flat), and ♮ (natural). We call these labeled tones notes. The distance between notes defines different scales. In Western music, we refer to half steps and whole steps to measure this distance. The chromatic scale is built from twelve half steps. From the chromatic scale, we get major and minor scales as well as other modes. A mode is a reorganization of a scale. There are seven modes in Western music: Ionian (the major scale), Dorian, Phrygian, Lydian, Mixolydian, Aeolean (the natural m...