Which singer performed vocals in McDonald's early “I'm Lovin' It” campaign material?

Justin Timberlake performed vocals in early McDonald's “I'm Lovin' It” campaign material.

McDonald's introduced the campaign internationally in 2003, using the phrase and its musical hook across advertisements. Timberlake was connected with the early vocal recording, while the campaign itself was developed through advertising and music-industry collaboration rather than being a conventional pop single released solely under his name.

The association can cause confusion because other musicians and producers were involved with versions of the music and with later McDonald's advertising. The most important branding element for the company was the short phrase and its recurring five-note sound mark.

Timberlake's involvement helped give the launch a contemporary pop-culture profile. It did not mean that “I'm Lovin' It” was simply a Timberlake song; it was a McDonald's corporate advertising campaign built for repeated use in many countries.