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The song “It’s A Fire” by Portishead features complex harmonic structures, distinguished by a fusion of pop, rock, and elements of jazz harmonies. The band, known for their trip-hop style, employ chromatically richer harmony and non-diatonic chord progressions in this piece. The chord progression of ‘It’s A Fire’ is consistent with this approach as we see the frequent use of suspended and minor chords alongside major ones, which creates a sense of unresolved tension. Borrowed chords, usually taken from the parallel minor or major key, are also used frequently to add stylistic color to the harmony.

The “Glory Box” by Portishead chorus progression is based in D minor and moves between this primary D minor chord and three other chords: Dm/C, Bm7b5, and Bbmaj7. The Dm/C chord is the same as the D minor, but with a different note in the bass (C). The Bm7b5 is a half-diminished chord. The Bbmaj7 is major seventh chord.

“Penny Lane,” written by the Beatles, utilizes key changes and borrowed chords to create an interesting and complex tonal palette. The song is best understood to primarily be in the key of A Major; however, it frequently borrows chords from the parallel minor key, uses unexpected dominant chords, and briefly modulates to other key areas for color and variety. This is characteristic of several Beatles songs, and it’s one of the ways they added complexity to their music while still remaining accessible.

Vance Joy’s “Riptide” is a remarkably simple yet highly effective song written in the key of C Major. The song follows a repetitive I-vi-IV chord progression, which is only varied in the bridge where a minor seventh chord introduces tension before leading back to the song’s major tonality.

“Cant Buy Me Love” by The Beatles, is a song in the key of C Major, but it has an interesting harmonic structure, especially in the chorus. The song features a number of borrowed and secondary dominant chords to create tension that resolves into the tonic chord. The chorus’s progression can be seen as a series of descending minor thirds, with an unexpected shift to a ii-V-I progression which is quite popular in jazz music.

Portishead – Its A Fire – Chorus

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Chord Progression

[‘F#’, ‘C#’, ‘B’, ‘F#’, ‘C#’, ‘B’, ‘F#’, ‘C#’, ‘B’, ‘F#’, ‘C#’]

Chord Progression Analysis

We can say the song is in the key of F# Major, but the presence of chromatically foreign chords suggest a modal interchange behavior, where chords are borrowed from the parallel minor key. Here is the analysis of the chorus:

Chord progression: F# Major (I), C# Major (V), B Major (IV), repeated three times.

By examining the rest of the chords listed in the song, it seems that the verses and bridge sections may incorporate elements of modal interchange, borrowing chords from various modes.

Here is the processed chord progression in Roman Numerals formatted as requested:

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Similar Chord Progressions

In terms of style, the chord progression is a characteristic of Portishead’s affinity for blending elements of electronica, trip-hop, and jazz. Their unique blend of these oh-so-different styles creates an eerie, yet beautiful soundscape. The repeated chord progression in the chorus allows for the vocalist’s melody to weave in and out of the harmony, giving a spectral and ethereal quality to the piece.

Musical Analysis

F# Major (I)
C# Major (V)
B Major (IV)
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Overall Analysis

“It’s A Fire” by Portishead is a song characterized by its frequent modulations and use of borrowed chords, making it a considerable complexity in terms of harmony. It features transition from key centers and borrowed chords from other keys, which creates tension and resolution creating the signature moody and intense atmosphere Portishead is known for.

Style Analysis

The chord progression F# – C# – B is peculiar and rich, with a traditional sense of movement. The I-V-IV progression provides a strong, familiar sound, with a bit of uniqueness due to the interesting ending on the IV chord.

Together, the chords provide a melancholic and soulful atmosphere. The C# Major chord is particularly striking, demonstrating a modulation or accidental borrowing that heightens the emotive quality of the song. The song makes use of diatonic and non-diatonic chords, creating a rich harmonic landscape.

Chords in the Chorus section of Its A Fire by Portishead are:

[‘F#’, ‘C#’, ‘B’, ‘F#’, ‘C#’, ‘B’, ‘F#’, ‘C#’, ‘B’, ‘F#’, ‘C#’]