The 'Perfect Harmony' campaign finds Taio Cruz penning the opening of each verse, but leaving the rest up to fans aged 18 or over to submit lyric suggestions via the American idol website. The top three lyrics selected by Coca-Cola will then go to a public vote, with the resulting track performed live in front of millions of viewers.

"Music has always been a part of our brand voice and with this program we're moving to a whole new level ...