McCartney Times

The crossover between Beatles songs and solo songs was never much of an issue. By and large, nobody in the band was contemplating a full solo career outside of the band while they were together. Paul McCartney frequently gave away songs not used by The Beatles to artists like Mary Hopkin and Peter & Gordon, while John Lennon and George Harrison both put out experimental solo releases before The Beatles officially disbanded.

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Source: The Beatles song that Paul McCartney kept for his solo debut