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“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.

“Sour Times” by Portishead is largely written in the key of C# minor, with elements of modal interchange and chromaticism that contribute to its haunting, dark sound. The song exhibits a remarkable amount of harmonic complexity and non-diatonic harmony, which is a defining characteristic of the trip-hop genre. The piece makes use of intricate inversions and chromatic voice leading, along with a frequent use of sevenths and diminished chords for added tension.

“Somewhere Only We Know” composed by Keane, is a pop-ballad that is based in the key of A Minor. It makes use of both diatonic and borrowed chords in a modern pop style progression that creates an oscillating feel, with repetition for familiarity and simple melody drawn from the underlying chords.

The chord progression in Weezer’s “Perfect Situation” is a simple and repetitive progression that cycles through three chords, G, D, and Am, with D being used as a transitional or “passing” chord. This progression is based on the I – V – ii structure in the key of G major.

“Brown Sugar” by The Rolling Stones is based in the key of C major. The verse has a simple and catchy chord progression that primarily revolves around the I and IV chords in the key, with brief excursions to the dominant and a borrowed chord from the parallel minor key. This structure contributes to the song’s bluesy and rock’n’roll sound.

Portishead – Its A Fire – Verse 1

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Chord Progression

[‘Gsus4’, ‘G’, ‘Bm’, ‘D’, ‘F’, ‘Gsus4’, ‘G’, ‘Em’, ‘G’, ‘Em’, ‘G’, ‘F’, ‘E’]

Chord Progression Analysis

Chord Progression: [‘Gsus4’, ‘G’, ‘Bm’, ‘D’, ‘F’, ‘Gsus4’, ‘G’, ‘Em’, ‘G’, ‘Em’, ‘G’, ‘F’, ‘E’]

Translating chords to Roman Numerals (Assuming G Major as our key):

Gsus4 (Isus4)
G (I)
Bm (iii)
D (V)
F (♭VII / a borrowed chord from G minor)
Gsus4 (Isus4)
G (I)
Em (vi)
G (I)
Em (vi)
G (I)
F (♭VII / a borrowed chord from G minor)
E (vi / a borrowed chord from G minor)

“`
Full Chord name (‘Roman Numeral)
Gsus4 (Isus4)
G (I)
Bm (iii)
D (V)
F (♭VII)
Gsus4 (Isus4)
G (I)
Em (vi)
G (I)
Em (vi)
G (I)
F (♭VII)
E (VII)
“`

Similar Chord Progressions

The chromaticism and complex harmonic structures in “It’s A Fire” bear similarities to those found in many works of Radiohead, especially “Paranoid Android,” and in some of the darker pieces of David Bowie such as “Life on Mars.”

Radiohead – Paranoid Android:
[‘Em’, ‘G’, ‘B’, ‘D’, ‘C’, ‘F#’, ‘Em’, ‘G’, ‘Am’, ‘Em’, ‘G’, ‘Am’, ‘C’, ‘B’]

David Bowie – Life on Mars:
[‘F’, ‘Em’, ‘Dm’, ‘F’, ‘G’, ‘Bb’, ‘Am’, ‘Bb’, ‘Dm’, ‘Em’, ‘A’, ‘Dm’, ‘Em’, ‘F’].

Note: For the purpose of this analysis, assume that these songs are in the keys of E minor and F major, respectively.

Musical Analysis

The use of suspended chords and borrowed chords in this song suggests a sense of emotional ambiguity, shifting between tension and release. Additionally, the resolution from Gsus4 to G creates a tension-release pattern that gives a color characteristic of Portishead’s style.

Overall Analysis

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.

Style Analysis

Portishead is known for their unique fusion of electronic music, hip hop beats, and jazz elements, a style often referred to as trip hop. Their use of complex chord structures, borrowed chords, and non-diatonic harmonies is consistent with the genre’s mood-setting characteristics, offering an intricate texture and emotional depth that’s distinguishing of their style.

Chords in the Verse 1 section of Its A Fire by Portishead are:

[‘Gsus4’, ‘G’, ‘Bm’, ‘D’, ‘F’, ‘Gsus4’, ‘G’, ‘Em’, ‘G’, ‘Em’, ‘G’, ‘F’, ‘E’]