Which singer performed the featured vocals on the 2003 McDonald's “I'm Lovin' It” campaign track?

Justin Timberlake performed the featured vocals on the 2003 McDonald's “I'm Lovin' It” campaign track.

The campaign used a musical hook alongside its slogan, helping the phrase become recognizable in television and other advertising. Timberlake's vocals connected the commercial track with a major contemporary pop performer, giving the campaign additional entertainment visibility.

The production involved the music agency Mona Davis Music and collaborators including Pharrell Williams. Because several people contributed to the track and campaign, the song's credits are sometimes reduced incorrectly to a single artist. Timberlake is the featured vocalist associated with the released track.

This musical association should not be confused with the separate question of who coined the slogan or who created the advertising concept. The brand campaign, its music, and its commercial production had overlapping but different credits.