A week later, Sgt. Pepper's Lonely Hearts Club Band was reissued with new stereo mixes and unreleased material for the album's 50th anniversary. Similar box sets were released for The Beatles in November 2018, and Abbey Road in September 2019. On the first week of October 2019, Abbey Road returned to number one on the UK Albums Chart. The Beatles broke their own record for the album with the longest gap between topping the charts as Abbey Road hit the top spot 50 years after its original release. 2020s In November 2021, The Beatles: Get Back, a documentary directed by Peter Jackson using footage captured for the Let It Be film, was released on Disney+ as a three-part miniseries. A book also titled The Beatles: Get Back was released on 12 October, ahead of the documentary. A super deluxe version of the Let It Be album was released on 15 October. In January 2022, an album titled Get Back (Rooftop Performance), consisting of newly mixed audio of the Beatles' rooftop performance, was released on streaming services. In October 2022, a special edition of Revolver was released, featuring unreleased demos, studio outtakes, the original mono mix and a new stereo remix using de-mixing technology developed by Peter Jackson's WingNuts Films. Musical style and development In Icons of Rock: An Encyclopedia of the Legends Who Changed Music Forever, Scott Schinder and Andy Schwartz describe the Beatles' musical evolution: In The Beatles as Musicians, Walter Everett describes Lennon and McCartney's contrasting motivations and approaches to composition: "McCartney may be said to have constantly developed – as a means to entertain – a focused musical talent with an ear for counterpoint and other aspects of craft in the demonstration of a universally agreed-upon common language that he did much to enrich. Conversely, Lennon's mature music is best appreciated as the daring product of a largely unconscious, searching but undisciplined artistic sensibility." Ian MacDonald describes McCartney as "a natural melodist – a creator of tunes capable of existing apart from their harmony". His melody lines are characterised as primarily "vertical", employing wide, consonant intervals which express his "extrovert energy and optimism". Conversely, Lennon's "sedentary, ironic personality" is reflected in a "horizontal" approach featuring minimal, dissonant intervals and repetitive melodies which rely on their harmonic accompaniment for interest: "Basically a realist, he instinctively kept his melodies close to the rhythms and cadences of speech, colouring his