Which singer's song helped launch McDonald's “I'm Lovin' It” campaign in 2003?

Justin Timberlake's song helped launch McDonald's “I'm Lovin' It” campaign in 2003.

Timberlake recorded a song titled “I'm Lovin' It,” and the campaign used music, advertising, and a recurring vocal hook to connect the slogan with contemporary popular culture. The campaign's musical identity became one of McDonald's most recognizable branding elements.

The arrangement and production involved the Neptunes, the production team associated with Pharrell Williams and Chad Hugo. Pharrell also wrote and produced the song, which is why the people involved are sometimes conflated.

Timberlake's role was as the featured recording artist and vocalist. The campaign was not simply a music release; it was a coordinated international advertising platform built around a slogan, sound, and visual identity.