Which musician performed the vocals on McDonald’s original “I’m Lovin’ It” campaign song?

Justin Timberlake performed the vocals on McDonald’s original “I’m Lovin’ It” campaign song.

The campaign’s musical identity grew from a song recorded by Timberlake, with production associated with The Neptunes and a jingle developed for McDonald’s advertising. The music helped make the slogan memorable and gave the international campaign a recognizable pop-culture connection.

Timberlake’s involvement is sometimes reduced to a celebrity endorsement, but his role specifically included performing the vocals used in the campaign’s musical material. The campaign itself launched in 2003 and was adapted for different markets.

The song and slogan are also sometimes attributed entirely to the advertising agency or producers. Those contributors shaped the campaign, but Timberlake is the vocalist most directly associated with the original recording.