🎭 Same Sound, Different Name
Screen 3 of 3from Mr Zuber’s handoutsA4 augmented 4th
C1D2E3F♯4
4 letters → a 4th. One half step wider than the perfect 4th C–F, so it is augmented.
d5 diminished 5th
C1D2E3F4G♭5
5 letters → a 5th. One half step narrower than the perfect 5th C–G, so it is diminished.
Mr Zuber’s tip: Both are 6 half steps and sound exactly the same! The interval’s number comes from counting letter names, not half steps.