Augmented 4th/ Diminished 5th Descending
The augmented 4th is an interval that spans four notes on the musical staff. The diminished 5th spans five notes on the musical staff. While they have different names these two intervals are the same size. They are both made up of 6 semitones or 3 whole tones, which is why they can be called a Tritone.
Listen to the recording to hear the relationship between to top and bottom notes.
