in this instance, they provided "the cold ending followed by an unrelated coda", having similarly pioneered the "fade-out–fade-in coda" at the end of "Rain" and "Strawberry Fields Forever". The Beatles returned to the song on 19 October, two days after attending a memorial service for Epstein at the New London Synagogue on Abbey Road. At this session, Harrison added his lead guitar parts (treated with Leslie effect), McCartney recorded the lead vocal, and Lennon, McCartney and Harrison supplied backing vocals; handclaps were also overdubbed. With two reduction mixes having been carried out since 2 October, to free up space on the four-track tape for these and later overdubs, the master take was now nominally take 16. This version of the song appeared on the 1996 outtakes compilation Anthology 2. In his book The Unreleased Beatles, Unterberger writes that take 16 features a more "active" guitar line from Harrison, who answers McCartney's vocal phrasing over the opening verse with a series of descending fills. Also present on this version is a short guitar solo, which would be replaced on the official release by what Unterberger terms "some inspired Paul scat-tinged singing". Unterberger speculates that the removal of these guitar parts may have caused tension between McCartney and Harrison, anticipating the pair's disagreements regarding the lead guitarist's role on McCartney compositions such as "Hey Jude" and "Two of Us" over 1968–69. Two violas were added to "Hello, Goodbye" at Abbey Road on 20 October. These string parts were played by classical musicians Kenneth Essex and Leo Brinbaum, and scored by Martin, who based the arrangement on a melody McCartney supplied on piano. McCartney overdubbed bass guitar on 25 October and, following a trip to Nice in France to film his "Fool on the Hill" segment for Magical Mystery Tour, added further bass to the track on 2 November. A mono mix of "Hello, Goodbye" was completed that same day, and the stereo version on 6 November. Release "Hello, Goodbye" was selected as the Beatles' single for the 1967 Christmas season, their first release since Epstein's death. Lennon pushed for his composition "I Am the Walrus" to be the A-side instead, but then ceded to McCartney and Martin's insistence that "Hello, Goodbye" was the more commercial of the two tracks. Lennon remained dismissive of the song; he later said: Hello, Goodbye' beat out 'I Am the Walrus' ... Can you believe that? I