Abbey Road's "Oh! Darling" became a point of disagreement between the two Beatles principals, with Lennon contending that McCartney's aggressive vocal approach was miscast and that he possessed superior capability to deliver the song's demanding performance. Lennon's critique centred on McCartney's vocal technique being fundamentally incompatible with the song's character, suggesting his own interpretive gifts would have better served the composition.

McCartney defended his performance as the product of deliberate artistic refinement, having tested various vocal approaches before settling on a technique he deemed essential to realising the song's potential. The record reflected this choice as consequential for his subsequent solo work, where he displayed increased confidence tackling material requiring his voice to operate at its highest reaches, establishing a vocal versatility demonstrated in tracks released shortly thereafter.