“Today” by The Smashing Pumpkins is composed in the key of E minor. The song has quite a simple structure and harmony with a strong emphasis on the I-IV-V (D-G-A in E minor key) chord progression which is one of the most common patterns in popular music. This I-IV-V progression vests the song with its harmonic backbone and creates a strong, wide-open sonic canvas.
“Tonight, Tonight” by The Smashing Pumpkins is a rock song happy to embrace classical music tropes. An orchestral, string-heavy arrangement propels the song, surrounding the listener with a rich tapestry of sound. The grandiose sound of the full orchestra is bolstered by the band’s dual guitars and Billy Corgan’s characteristic singing.
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Given by the chords you’ve provided, it appears the song “Today” by The Smashing Pumpkins is primarily in the key of D Major with occasional borrowed chords from D minor and E minor. The varying uses of D Major, D minor, and E minor really showcase the variety in Billy Corgan’s guitar writing.
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“A Star is Born – Shallow” is primarily in the key of G major and has a fairly simple and straightforward chord progression with an intriguing twist toward the end. The song features a common I-V-vi-IV chord progression with an occasional ii-chord (Am) substituting for the vi-chord (Em). Then, it introducess a borrowed chord (Bm) which creates an interesting, unexpected color in the harmony.
The song “3 Libras Acoustic Live” by A Perfect Circle oscillates between an A major and a C# minor structure, with a D major introduced at the end of the progression. The dominant chords are A (represented as Asus2) and C# (represented as C#m). The final D chord can be seen as a modulation, adding a somewhat unexpected resolution that doesn’t adhere to the traditional rules of tonic-dominant resolution in either major or minor keys.
“Disarm” by The Smashing Pumpkins is a piece that showcases a rather common chord progression structure in pop music, but with added embellishments and variations. The featured chords include Dsus, Em7, Cadd9, G, and Dsus/F# with a key signature suggesting that the song is in the key of G major or E minor. The prominent chord in the outro is Dsus which suggests that the song might be interpreted in the D Mixolydian mode. The use of the slash chord (D/F#) diversifies the sound of the progression and adds harmonic richness. This chord progression uses both diatonic and borrowed chords creating a familiar but interesting sound.
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