The second verse of the song adds accompaniment from acoustic guitar and tambourine. Tim Riley writes that, with the "restrained tom-tom and cymbal fill" that introduces the drum part, "the piano shifts downward to add a flat seventh to the tonic chord, making the downbeat of the bridge the point of arrival ('And any time you feel the "pain")." At the end of each bridge, McCartney sings a brief phrase ("Na-na-na na …"), supported by an electric guitar fill, before playing a piano fill that leads to the next verse. According to Riley, this vocal phrase serves to "reorient the harmony for the verse as the piano figure turns upside down into a vocal aside". Additional musical details, such as tambourine on the third verse and subtle harmonies accompanying the lead vocal, are added to sustain interest throughout the four-verse, two-bridge song.