John Mayer co-wrote the song "Half of My Heart" about Taylor Swift. The track appears on Mayer’s 2009 album Battle Studies, and both artists have described the song as reflecting their brief but high-profile relationship in 2009. In public comments and interviews, they’ve framed the song as a candid look at the push-pull of a young relationship marked by attention, timing, and mutual respect. Below is a compact verification of the who, what, when, and how of the song and its link to Swift.
