Our latest episode of Soundtracking is with composer Paul Saunderson, who has scored the BBC documentary Earth, which is available to watch now on the BBC iPlayer. Hosted by the wonderful Chris Packham, the show explores some of the most significant moments in our planet's history, from asteroid bombardments to extreme changes in climate to the collision of continents, using groundbreaking science and effects. The fact there are informed recreations of seismic events in the past affords Paul plenty of scope to push the sonic envelope - almost as if he were scoring a science fiction film rather than a traditional documentary. The results are magnificent.