Which musician sang the lead vocals on McDonald's “I'm Lovin' It” advertising track?

Justin Timberlake sang the lead vocals on the McDonald's “I'm Lovin' It” advertising track.

The campaign launched in 2003 and used music to give McDonald's a recognizable contemporary identity. Timberlake's vocal performance helped connect the advertising phrase with a pop-oriented sound that could travel across markets.

The track's development involved several creative contributors, which is why the song is sometimes described only as a McDonald's jingle or attributed broadly to the production team. Timberlake's role was the lead vocal performance, not ownership of every part of the campaign.

The slogan and musical hook became more important to the brand than any single commercial. This helped McDonald's maintain a consistent identity while adapting the advertisements and supporting visuals for different countries.