The top 10 highest-grossing songs in the history of music royalties have been revealed, in a new documentary from BBC Four.

The programme The Richest Songs In The World is still available to stream on iPlayer until Saturday (5 January) and, as well as sharing the highest-earning songs, also reveals how music royalties work.

Unsurprisingly, 'Happy Birthday' makes it on there - the royalties of which have been owned by Warner Chappell since he bought them in 1990, although it was originally written by sisters Patty and Mildred J. Hill.

British talent is represented, with both The Beatles and The Police making it onto the list, as well as a host of Christmas classics. Click through to the gallery for the full list...