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“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.

“Something” is composed in C Major; however, it modulates to several different keys. The song’s chord progression is relatively complex and less adherent to traditional tonality, typical of much of The Beatles’ work, particularly in their later years. Throughout the song, they make use of several common progressions, but with a few unique changes.

“Maxwell’s Silver Hammer,” composed by Paul McCartney, is a pop song that sits in the key of D Major throughout. However, it does borrow chords from the parallel minor. This technique, known as modal interchange or borrowed chords, is common in popular music and especially in classical compositions by iconic bands like The Beatles.

“God Only Knows” by The Beach Boys showcases the artistic depth and compositional craft of Brian Wilson, the band’s primary songwriter. The song utilizes a complex chord progression and key changes that are unconventional for pop music of its time. The chord progression creates a sense of constant mood transitions, similar to arias in Romantic era music.

The verse chord progression in Beck’s “Girl Acoustic” features a bright and uplifting feel, with a mix of major and minor chords. The progression is in the key of A major and showcases a simplicity that is common in pop and folk music.

All You Need Is Love

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“All You Need Is Love” is in the key of G major. The song primarily uses the chords within the key signature and has a relatively simple harmonic structure. However, the song does utilize a few distinct chord choices that contribute to its unique sonic character. The song applies modal interchange with an inclusion of A minor from the G Mixolydian mode and the D7 and D6 which evoke a hint of the D Mixolydian mode.