What five-note audio signature became associated with McDonald's “I'm Lovin' It” campaign?

The five-note “ba da ba ba ba” jingle became associated with McDonald's “I'm Lovin' It” campaign.

The short vocal phrase was designed to work as an audio logo: a compact sound that could identify the brand even when the full advertisement was not shown. It accompanied the international campaign launched in 2003 and became closely linked to the slogan's final line.

The audio signature was especially effective because it was brief, rhythmic, and easy to adapt across languages and advertising formats. McDonald's used it in television commercials, online videos, radio material, and other promotional settings.

People sometimes treat the phrase as a song title or as the slogan itself. The slogan is “I'm Lovin' It”; the “ba da ba ba ba” phrase is the campaign's memorable musical signature.