The song, one of many of Wonder's songs to feature the use of a keyboard synthesizer, features Wonder lamenting the fact that anyone would oppose the idea of a Dr. King holiday, where "peace is celebrated throughout the world" and singing to King in the chorus, "Happy birthday to you". The holiday, he proposes, would facilitate the realization of Dr. King's dreams of integration and "love and unity for all of God's children".
Wonder used the song to popularize the campaign, and continued his fight for the holiday, holding the Rally for Peace Press Conference in 1981. United States President Ronald Reagan approved the creation of the holiday, signing it into existence on November 2, 1983. The first official Martin Luther King, Jr. Day, held the third Monday in January of each year, was held on January 20, 1986, and was commemorated with a large-scale concert, where Stevie Wonder was the headlining performer.