Which musician was featured on the song connected to McDonald's 2003 “I'm Lovin' It” campaign?

Justin Timberlake was featured on the song connected to McDonald's 2003 “I'm Lovin' It” campaign.

The campaign used a song titled “I'm Lovin' It,” performed by Timberlake, and paired it with the now-famous “ba da ba ba ba” musical signature. The music helped make the advertising line recognizable beyond the printed slogan and linked the campaign to contemporary pop culture.

McDonald's developed the campaign as a global marketing platform rather than a single national commercial. Its advertising appeared in multiple markets, with local adaptations alongside the shared English-language brand idea.

Timberlake's role is sometimes confused with the campaign's advertising agencies or with the people credited for writing and producing the music. The question concerns the featured performer associated with the song, not the agency responsible for the overall branding campaign.