 The opening theme for "On Her Majesty's Secret Service" proved challenging for composer John Barry.The convention in the previous James Bond films was to accompany the opening credits with a song whose lyrics included the film's title.This film became the first in the series since "From Russia with Love" to deviate from this rule (and "From Russia with Love" had differed only in featuring the song, sung by Matt Monro, at the end of the film rather than the beginning).