Pop Art vignettes, where the lyrics are starting to match the quality of the melodies and arrangements." Scott Plagenhoef of Pitchfork describes the album as "the most important artistic leap in the Beatles' career – the signpost that signaled a shift away from Beatlemania and the heavy demands of teen pop, toward more introspective, adult subject matter". Paul Du Noyer wrote in his review for Blender in 2004: "Their talent was already a source of wonder, but now the songs themselves were turning mysterious. Under the influence of Bob Dylan – and, it might be said, marijuana – the Fab Four laced their tunefulness with new introspection, wordplay and social comment. University professors and newspaper columnists started taking note." Writing in Paste, Mark Kemp says that the influence of Dylan and the Byrds seems overt at times but the album marks the start of the Beatles' peak in creativity and, in the context of 1965, offered "an unprecedented synthesis of elements from folk-rock and beyond". According to Richie Unterberger of AllMusic, the album's lyrics represented "a quantum leap in terms of thoughtfulness, maturity, and complex ambiguities", while the music was similarly progressive in its use of sounds beyond "the conventional instrumental parameters of the rock group". He adds that Rubber Soul is "full of great tunes" from Lennon and McCartney notwithstanding their divergence from a common style, and demonstrates that Harrison "was also developing into a fine songwriter". Writing in the Encyclopedia of Popular Music, Colin Larkin describes it as "not a collection of would-be hits or favourite cover versions … but a startlingly diverse collection, ranging from the pointed satire of 'Nowhere Man' to the intensely reflective 'In My Life'." In the 2004 edition of The Rolling Stone Album Guide, Rob Sheffield recognises Help! as "the first chapter in the [Beatles'] astounding creative takeoff", after which the band "grew up with an album of bittersweet romance, singing adult love ballads that feel worldly but not jaded". In an article coinciding with the 50th anniversary of its release, for The Guardian, Bob Stanley lamented that Rubber Soul was often overlooked in appraisals of the Beatles' recording career, whereas Revolver and The Beatles had each gained in stature to surpass Sgt. Pepper. Stanley highlighted Rubber Soul as having been "a good 18 months ahead of its time" and "the first album of the rock era that sounded like an album". Also