A perfect fourth is an interval of 5 semitones (half steps) between 2 notes. For example, if you play middle C on the piano followed by the F above it then you will have played a perfect 4th interval: Perfect Fourth Piano Example The F is 5 semitones higher than the C and so the interval is described as a perfect fourth. This can be repeated on any starting note of the chromatic scale. For example, if you play a G sharp on the piano and count up 5 semitones you will reach C sharp – this interval is also

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