![]() If both notes are altered by the same amount and in the same direction, it is still a perfect fifth. When a fifth involves a note with an accidental, all that need be done is to make sure that the other note has the same accidental. The F can be raised using a sharp, or a flat can be added to the B to keep the interval at 7 half-steps. An accidental needs to be used to expand it back out to seven half-steps. This makes the interval a half-step smaller than the others (making it six half-steps). The only exception is when both of the half-step points are inside the interval (this only occurs with the interval between B and F). Most fifths that do not use accidentals are perfect. A perfect fifth is a fifth made of seven half-steps. When learning about key signatures and the circle of fifths, not just any fifth will work perfect fifths (P5) must be used. The easiest way to decide whether or not an interval is a fifth is to count both the lines and spaces starting with the bottom note, and ending with the space or line that the top note is on. ![]() Key Signatures and the Ionian (Major) ScaleĪ fifth is an interval in which the top note is two spaces and two lines away from the bottom note.Things to read before reading about the circle of fifths:
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