What is the most popular song of McFly?

The most popular song by McFly is "All About You". It was released in 2005 as the lead single from their second studio album, "Wonderland". The song peaked at number one on the UK Singles Chart and became one of the band's most successful singles. It is an upbeat pop-rock song about love and infatuation, and its upbeat tune and catchy lyrics have made it a popular choice for parties and dancing.