Stirling's collaborations with other musicians and singers have included Amy Lee (Evanescence) (Love Goes On And On), Shaun Barrowes ("Don't Carry It All" – The Decemberists), Jake Bruene and Frank Sacramone ("Party Rock Anthem" – LMFAO), Tay Zonday ("Mama Economy"), Peter Hollens ("Skyrim", "A Thousand Years", "Game of Thrones" and "Star Wars"), Lzzy Hale ("Shatter Me"), Alisha Popat ("We Found Love"), John Allred ("Tomb"), Amiee Proal ("A Thousand Years"), Megan Nicole ("Starships"), The Piano Guys ("Mission Impossible"), Debi Richards (née Johanson) ("River Flows in You", "Phantom of the Opera"), Sam Tsui ("Heads Up"), Tyler Ward ("I Knew You Were Trouble", Thrift Shop"), Kurt Hugo Schneider ("Pokémon Dubstep Remix" and "A Thousand Years"), John Legend ("All of Me"), Chester See ("I Knew You Were Trouble"), and Pentatonix ("Radioactive", "Papaoutai", “Over the River”).