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“A Hard Day’s Night” by the Beatles is in the key of G Major. According to the provided list, the song has an array of major, minor, and some of the seventh and suspended chords, which is quite typical for the pop and rock genres. The coda appears to be a cyclic repetition of a phrase involving a transition from a C Major to a G Major chord, before leading to the repeated sequence of D7sus4, Dm7 chords. The D7sus4 and Dm7 chords give an interesting tension and release effect, as the suspension wants to resolve to the minor chord, while the minor chord creates an expectation for a return to the root chord.

“When I Was Your Man” by Bruno Mars is in the key of C major. It is a ballad with a piano-led instrumentation, backed by Bruno’s powerful and emotive vocals. The melody and chords are relatively simple, but the lingering tone and the poignant lyrics create an emotionally resonant track. A common feature in this piece, as well as many pop songs in general, is the use of borrowed chords.

“Can’t Buy Me Love,” a song by The Beatles, exhibits a style that’s emblematic of their earlier work, with a clear, upbeat tonality and an elegant yet straightforward chord progression. The tune is predominantly centred in the key of C major, but it utilizes both major and dominant 7th chords to create tension and resolution, modulating away from the home key. The particular progression you’ve given, ‘C7’, ‘F7’, ‘C’, isn’t rare and demonstrates the Beatles’ precision and understanding of pop and rock music’s creative possibilities.

The chorus from Jeff Buckley’s rendition of “Hallelujah” in the key of C major beautifully demonstrates a diverse range of chords and harmonic techniques. The chord progression incorporates diatonic chords, borrowed chords, and some unexpected harmonic twists, all of which work together to create a sense of emotional depth and tension throughout the chorus.

The song “I Will” by The Beatles is an example of their unique and sophisticated approach to pop songwriting, demonstrating their comprehensive mastery of harmony within the pop idiom. The majority of the harmonies used in the song are diatonic to the key of C major, however there are several instances of borrowed chords that add color and complexity to the song’s overall harmonic structure.