The perfect fourth (P4) is a core interval in tonal and modal music. It spans 5 semitones and carries a clear, open sound that can feel stable or directional depending on harmonic context.
Construction and spelling
P4 runs from the root to the fourth scale degree, such as C to F, D to G, or A to D. It belongs to the perfect interval family (P1, P4, P5, P8). Keep note spelling consistent so analysis and voice leading remain readable.
Harmonic and melodic usage
Melodically, a fourth leap sounds broad and singable. Harmonically, P4 appears in suspended chords and quartal textures, where it gives a modern, open color. Against a bass root, a fourth can imply suspension that wants to resolve.
Examples
- Sus4 chords in pop and rock harmony
- Quartal voicings in jazz and film music
- Melodic themes that outline a fourth for clear contour
In practice
Practice P4 from multiple roots, ascending and descending, and identify it in melodies and suspended harmonies. Compare P4 with P5 to hear how their direction and weight differ. Strong P4 recognition improves harmonic interpretation and intonation control.
Examples of Perfect fourth used in songs
Real tracks where you can hear this interval and practice it with movable-do syllables.
Hedwig's theme
Harry PotterYou've probably seen the movie Harry Potter? John Williams made the beautiful, magical music for this movie. Hedwig's Theme starts with an ascending perfect fourth interval.
I'll be there for you
The RembrandtsYou probably know this song as the Themesong for Friends. The first two words form a perfect fourth: So-no.
Fixing a hole
The BeatlesWe simply can not make a playlist without a song by our favourite band, The Beatles. In the beginning of the song you'll hear the perfect fourth in the first two notes of the melody (I'm-fixing).
Don't you worry 'bout a thing
Stevie WonderIn the verse you'll hear the perfect fourth in A-Thing.
Love me tender
Elvis PresleyThis classic has to be on the list. When Elvis sings Love-me and You-have you'll hear the perfect fourth.
Thistle & Weeds
Mumford & SonsIn this song you can hear a perfect fourth in the verses. The first time when 'cause-recently is sang.
Amsterdam
ColdplayA song about Amsterdam, capital of Sonids homeland, must be included. In the beginning of the verse you'll hear a perfect fourth at And-I and And-If (Bb to Eb).
All the things you are
Ella FitzgeraldThis jazz standard starts with a perfect fourth.
Etude Opus 10 No 3 in E Major: Tristesse
ChopinThe first two notes of this composition form the perfect fourth.
I want to break free
QueenEvery time Freddy sings I-Want, you'll hear a perfect fourth. Please note that afterwards he goes one more note up.
