I don't yet know what my song of the year is, but I can tell you without hesitation what the song I've heard the most is, albeit not always in its recorded version: the Oscar-winning Let It Go. Technically, the song from Frozen is sung by Broadway star Idina Menzel in the role of Elsa the Snow Queen, but as far as my seven-year-old daughter - who has been singing it several times a day for weeks - is concerned, it's hers.
Like the snow in Frozen, Let It Go is everywhere, and it's not disappearing without a fight. It's the main reason why the Frozen soundtrack has been the No 1 album in the US for nine weeks and counting - Beyoncé only managed three - and a significant reason why the film became the highest-grossing animated movie of all time. On YouTube, where it sits alongside countless amateur cover versions, spoofs, supercuts and fan-made videos, the Let It Go sequence uploaded by Disney last December has attracted almost 180m views. Still, these mind-boggling statistics strike me less forcefully than my daughter's unprecedented obsession. To her, an older sister at an age where boys are beginning to become a source of intrigue rather than irritation, and conventional Disney princesses are a prissy drag, it's more than a song. It's a glimpse of the future, a vessel for secret knowledge.