Lennon was inspired to write "Good Morning Good Morning" after watching a television commercial for Kellogg's Corn Flakes, the jingle from which he adapted for the song's refrain. The track uses the bluesy Mixolydian mode in A, which Everett credits with "perfectly express Lennon's grievance against complacency". According to Greene, the song contrasts sharply with "She's Leaving Home" by providing "the more 'avant-garde' subversive study of suburban life". The time signature varies across 5/4, 3/4 and 4/4, while the arrangement includes a horn section comprising members of Sounds Inc. MacDonald highlights the "rollicking" brass score, Starr's drumming and McCartney's "coruscating pseudo-Indian guitar solo" among the elements that convey a sense of aggression on a track he deems a "disgusted canter through the muck, mayhem, and mundanity of the human farmyard". A series of animal noises appear during the fade-out that are sequenced – at Lennon's request – so that each successive animal could conceivably scare or devour the preceding one. The sound of a chicken clucking overlaps with a stray guitar note at the start of the next track, creating a seamless transition between the two songs.