Hey Jude climaxes with one of pop's most legendary hooks." Julian Lennon discovered that "Hey Jude" had been written for him almost 20 years after McCartney composed the song. He recalled of his and McCartney's relationship: "Paul and I used to hang about quite a bit – more than Dad and I did. We had a great friendship going and there seems to be far more pictures of me and Paul playing together at that age than there are pictures of me and my dad." In 1996, Julian paid £25,000 for the recording notes to "Hey Jude" at an auction. He spent
Hey Jude the song's double plagal cadence. During this coda, the rest of the band, backed by an orchestra that also provides backing vocals, repeats the phrase "Na-na-na na" followed by the words "hey Jude" until the song gradually fades out. In his analysis of the composition, musicologist Alan Pollack comments on the unusual structure of "Hey Jude", in that it uses a "binary form that combines a fully developed, hymn-like song together with an extended, mantra-like jam on a simple chord progression". Riley considers that the coda's repeated chord sequence (I–VII–IV–I) "answers all the musical questions raised at the beginnings and