Thirds (music)

musical interval encompassing three staff positions and four semitones, with a frequency ratio of approximately 5:4=1.25 (∛2 = 1.260… in equal temperament)

musical interval encompassing three staff positions and three semitones

thumb|Pythagorean ditone on C thumb|Pythagorean ditone as four just perfect fifths

musical interval of five semitones spanning three staff positions (e.g. from C to E♯); enharmonically equivalent to the perfect fourth