McDonald's: "You deserve a break today" (1971)
In 1970, Needham, Harper & Steers successfully pitched an upbeat, catchy melody to McDonald's, but they struggled with the lyrics. Noticing that the word "break" continuously surfaced in focus groups, copywriter Keith Reinhard finally wrote the perfect lyrics for the jingle. Within the next few years, global sales jumped from $587 million to $1.9 billion. The song was named the top jingle of the 20th century by Advertising Age.