Justin Timberlake performed the original commercial version associated with McDonald's “I'm lovin' it” campaign.
McDonald's launched the campaign in 2003, using a catchy musical hook to support the slogan. Timberlake recorded and performed a version of the song connected with the advertising campaign, helping give the phrase a strong pop-culture presence.
The campaign's music developed through contributions from several industry figures, including producer and songwriter collaborations. Because the advertising used a short hook repeatedly, many listeners remember the phrase more readily than the full song or its production history.
Timberlake's involvement does not mean he created the entire McDonald's campaign or owned the slogan. The branding line belonged to McDonald's, while Timberlake was the prominent recording artist associated with the commercial version.