  Seven Worlds One Planet’s lead composer has revealed how Sia sought out a position on the landmark series after vowing to work with legendary musician Hans Zimmer
  Sia and Hans worked together to create the epic title song that’s behind the new BBC documentary series, which focuses on the wonders of the world and the creatures that inhabit it one continent at the time
  Jacob Shea, lead composer at Bleeding Fingers Music, exclusively told Metro.co.uk that the collaborative effort was a long in the making
  ‘Sia had already expressed interest in being a part in one of these landmark series creatively,’ he told us and Hans [Zimmer] and Sia have wanted to work together
  ‘It was a very kismet kind of thing, and it was perfect timing. She was available and they both wanted to do it, so together they came up with this amazing track
’    Hans Zimmer, who leads the team alongside Jacob composing the music for the series, is also responsible for film-defining musical pieces including the Pirates of the Caribbean theme, Inception, The Dark Knight and the music for The Lion King original release
  He was also the brains behind Blue Planet II and Planet Earth II.  The eventual song with Sia, called Out There, was debuted alongside a first look of the series at Glastonbury early this year, with Sir David Attenborough making his main stage debut to talk about what we can do to save the planet
    Jacob had previously revealed the hidden secrets that went into making the soundtrack to the spectacular scenes for Antarctica that aired on on Sunday night
  On the key tracks for the show, he explained: ‘We based it all around these elemental principles, for all cultures, in my understanding
 ‘We kept the melody extremely simple, and kept to seven notes. Seven notes for seven worlds was the idea that came about
’  ‘We wanted to tie things together so that it could really exist in any guise, for instrumentation or playing around
’ he said of the soundtrack. ‘So we could place it in any continent and have it stand on its own
  ‘So that’s the thing that Hans [Zimmer] and I elaborated on and sent to the Seven Worlds team and they were receptive to that, so that was the theme for the show
’    ‘That became the theme for the show, and then I underscored each of the episodes,’ he added
  Seven Worlds, One Planet continues Sunday at 6.15pm on BBC One.          
