Disney's phenomenally successful film, Frozen, has a showstopper musical centrepiece. Let It Go, performed by Idina Menzel, won the Oscar for Best Original Song and has inspired countless cover versions and homages online. This week the entire original soundtrack has been certified double platinum, having sold over 600,000 copies.

The album is the biggest-selling film soundtrack since Mamma Mia!, and is on course to become the bestselling album of the year.

Let It Go has spent 28 consecutive weeks in the Top 40 of the UK Official Singles Chart, and is certified gold in its own right. The two official versions of the song have a combined total of nearly 500 million YouTube views, and four songs from the soundtrack are still in the Top 100 Official Singles Chart.

Ritch Sibthorpe, Managing Director of The Walt Disney Company, said: "Let It Go has become a true phenomenon and anthem for young families worldwide, evidenced by a rich outpouring of user generated content across social media."

The news comes in the same week it emerged that Frozen characters Anna and Kristoff will appear in the ABC fantasy series Once Upon a Time in the autumn.

Frozen is the most successful Walt Disney Company film ever, and demand for mechandise has outstripped supply. It's the highest-grossing animated picture of all time and the fifth highest-grossing film of any kind.

WATCH: Walt Disney Studios chairman Alan Horn discusses the billion-dollar success of Frozen