“All My Loving” by The Beatles is written in the key of D Major. It’s pop and rock style includes elements of British Invasion and Merseybeat. It shows a common chord progression modified with additional chords and modulation.
The song “Penny Lane” written by the Beatles is in the key of A major. The structure of Verse 4, specifically, has a very effective use of both diatonic (belonging naturally to the key) and borrowed chords (taken from a different key or mode). They have incorporated secondary dominants, pivot modulation, and modal interchange which reflect their knowledge of musical theory and compositional skills.
“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.
The Verse of “Us and Them” by Pink Floyd showcases a unique and non-diatonic chord progression that focuses on D mixolydian mode with added sus2 chords and an augmented chord. It deviates from traditional harmony patterns and creates a spacious, floating feel. The chords occur in a consistent pattern and are mostly slash chords with the constant presence of the D note in the bass, which further strengthens the D tonality.
“Buddy Holly” by Weezer is a power-pop/alternative rock song from their debut studio album “Weezer” (also known as the Blue Album) released in 1994. The verse chord progression features diatonic chords from the A major key, along with some inversions and techniques borrowed from other musical styles such as blues and rock.
“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.
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