Which musician performed the featured song associated with McDonald’s 2003 “I’m Lovin’ It” campaign?

Justin Timberlake performed the featured song associated with McDonald’s 2003 “I’m Lovin’ It” campaign.

The campaign used the phrase “I’m Lovin’ It” alongside a song performed by Justin Timberlake. Timberlake’s recording helped give the advertising campaign a contemporary pop-music identity and made the slogan especially memorable to television and radio audiences.

The campaign was developed internationally rather than as a single conventional U.S. commercial. German advertising agency Heye & Partner originated the concept, and McDonald’s adapted the campaign for markets around the world. The song and slogan were connected, but they were not the same thing: the slogan was the broad brand line, while Timberlake performed the musical component.

The campaign is also associated with production by The Neptunes and a songwriting credit involving Pusha T. Those behind-the-scenes details sometimes cause confusion about the answer, but Timberlake is the featured recording artist most directly associated with the song.