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Sequence of notes used in western music : C C # D D# E F F# G G# A A# B C C# …

Names of intervals
•    C  C#   D   D#   E     F   F#       G  G#    A   A#   B    C            — when the root is C
•    R  m2 M2 m3   M3  4  #4/b5   5  m6  M6  m7  M7  Root      — the interval names
•    G G#  A     A#   B    C    C#       D  D#    E    F    F#   G            — when G is the root.