Paul McCartney and John Lennon, the primary writing duo of the Beatles produced over 175 songs during the eight years the Beatles released their music. While they were the Beatles, any songs recorded carried both of their names but they didn’t actually collaborate of most of them.

In fact, they only co-wrote 27 of them. Of those, 21 came in the first 4 years. The later years saw them departing more from co-creatorship and they contributed only 6 in the second half of their career together.

You can usually tell who wrote the majority, if not all of the song, as they will be the ones singing the lead. They would often work with each other on the songs and while not fully collaborating, their input was noticeable.

George Harrison was no slouch either as a songwriter. Although he usually only contributed one, maybe two songs on an album after the first few, his strength as a songwriter grew immensely in the ending years of the Beatles. "While My Guitar Gently Weeps" was considered the best song on the Beatles White Album and George’s two hits on the last album produced (Abbey Road) are considered by many as the two best songs on the album, "Something" and "Here Comes the Sun." After the break-up of the Beatles, George exploded into a single career with hits such as "My Sweet Lord", "Bangladesh", "What is Life", "Give Me Love", and others.