Ostensibly simple, featuring only McCartney playing an Epiphone Texan steel-string acoustic guitar backed by a string quartet in one of the Beatles' first use of session musicians, "Yesterday" has two contrasting sections, differing in melody and rhythm, producing a sense of disjunction.
The first section ("Yesterday, all my troubles seemed so far away...") opens with an F chord (the 3rd of the chord is omitted, so although it sounds major the major tonality is only implied), then moving to Em7 before resolving to A7 and then to D-minor. In this sense, the opening chord is a decoy; as musicologist Alan Pollack points out, the home key (F-major) has little time to establish itself before "heading towards the relative D-minor." He points out that this diversion is a compositional device commonly used by Lennon and McCartney, which he describes as "delayed gratification".
The second section ("Why she had to go I don't know...") is, according to Pollack, less musically surprising on paper than it sounds.
Starting with Em7, the harmonic progression quickly moves through the A-major, D-minor, and (closer to F-major) B♭, before resolving back to F-major, and at the end of this, McCartney holds F while the strings descend to resolve to the home key to introduce the restatement of the first section, before a brief hummed closing phrase.
Pollack described the scoring as "truly inspired", citing it as an example of "[Lennon & McCartney's] flair for creating stylistic hybrids"; in particular, he praises the "ironic tension drawn between the schmaltzy content of what is played by the quartet and the restrained, spare nature of the medium in which it is played."
The tonic key of the song is F major (although, since McCartney tuned his guitar down a whole step, he was playing the chords as if it were in G), where the song begins before veering off into the key of D minor. It is this frequent use of the minor, and the ii-V7 chord progression (Em and A7 chords in this case) leading into it, that gives the song its melancholy aura. The A7 chord is an example of a secondary dominant, specifically a V/vi chord. The G7 chord in the bridge is another secondary dominant, in this case a V/V chord, but rather than resolve it to the expected chord, as with the A7 to Dm in the verse, McCartney instead follows it with the IV chord, a B♭. This motion creates a descending chromatic line of C–B–B♭–A to accompany the title lyric.
The string arrangement reinforces the song's air of sadness, in the groaning cello line that connects the two halves of the bridge, notably the "blue" seventh in the second bridge pass (the E♭ played after the vocal line, "I don't know / she wouldn't say") and in the descending run by the viola that segues the bridge back into the verses, mimicked by McCartney's vocal on the second pass of the bridge. This viola line and the high A sustained by the violin over the final verse are the only elements of the string arrangement attributable to McCartney rather than George Martin.
When the song was performed on The Ed Sullivan Show, it was done in the above-mentioned key of F, with McCartney as the only Beatle to perform, and the studio orchestra providing the string accompaniment. However, all of The Beatles played in a G-major version which was used in the Tokyo concerts during their 1966 tours.
When McCartney appeared on The Howard Stern Show, he stated that he owns the original lyrics to "Yesterday" written on the back of an envelope. McCartney later performed the original "Scrambled Eggs" version of the song, plus additional new lyrics, with Jimmy Fallon and The Roots on Late Night with Jimmy Fallon.
Special thanks to wikipedia.org
By: Shahen Gasparyan
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