The string arrangement reinforces the song's air of sadness, in the groaning cello line that connects the two-halves of the bridge, notably the "blue" seventh in the second bridge pass (the E played after the vocal line "I don't know / she wouldn't say") and in the descending run by the viola that segues the bridge back into the verses, mimicked by McCartney's vocal on the second pass of the bridge. This viola line, the "blue" cello phrase, the high A sustained by the violin over the final verse and the minimal use of vibrato are elements of the string arrangement attributable to McCartney rather than George Martin.