Which five-note sound is associated with McDonald's “I'm Lovin' It” branding?

The five-note sound associated with McDonald's “I'm Lovin' It” branding is “Ba da ba ba ba.”

The sound functions as an audio logo, or sonic signature, for the campaign introduced in 2003. It commonly appears at the end of McDonald's advertisements, where the notes reinforce the visual logo and slogan.

Unlike a traditional song with a long lyric, the short vocal phrase is designed for rapid recognition. Its simplicity allows it to work across languages and across different types of advertising, from television commercials to digital media.

The phrase is sometimes written with different punctuation or capitalization, but the familiar spoken form is “ba da ba ba ba.” It is not the slogan itself; “I'm Lovin' It” is the accompanying verbal line.