Lennon or McCartney

Wikipedia - "Lennon–McCartney (also written Lennon/McCartney and occasionally known as McCartney–Lennon) was the rock music songwriting partnership between English musicians John Lennon (9 October 1940 – 8 December 1980) and Paul McCartney (born 18 June 1942) of the Beatles. It is one of the best known and most successful musical collaborations in history. Between 1962 and 1969, the partnership published approximately 180 jointly credited songs, of which the vast majority were recorded by the Beatles, forming the bulk of their catalogue. Unlike many songwriting partnerships that comprise separate lyricist and composer, both Lennon and McCartney wrote words and music. Sometimes, especially early on, they would collaborate extensively when writing songs, working 'nose to nose and eyeball to eyeball'. Later, it became more common for one of the two credited authors to write all or most of a song with limited input from the other."
Wikipedia
Atlantic: The Power of Two
Main composer of the Beatles songs
YouTube: Lennon or McCartney