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Eric Whitacre's Virtual Choir. 2010. Eric Whitacre's Virtual Choir - 'Lux Aurumque'. [Online] [Accessed 19th May 2015]. Available from: https://www.youtube.com/watch?v=D7o7BrlbaDs

PTXofficial. 2015. [Official Video] Daft Punk - Pentatonix. [Online] [Accessed 19th May 2015]. Available from: https://www.youtube.com/watch?v=3MteSlpxCpo 

Under The Sun Studios. 2013. Vocal Warmup #1 for Soprano. [Online] [Accessed 19th May 2015]. Available from: https://www.youtube.com/watch?v=elv_ZKoMsfM

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Malone, G. 2013. Gareth Malone Voices Selections for SATB Chorus. London: Novello Publishing Limited.

Sierra Coleman. 2011. Sleep - Eric Whitacre (Lyrics). [Online] [Accessed 11th February 2015]. Available from: https://www.youtube.com/watch?v=bxjWNJU8rNE

Schwartz, S. 2003. Defying Gravity. Idina Menzel. Wicked (Original Broadway Cast Recording). [iTunes download] Decca Broadway/Universal Music.

Schwartz, S. 2003. Defying Gravity. [Musical Score] Grey dog Music. Available from: http://www.operalady.com/Vocal%20Sheet%20Music/Wicked_DefyingGravity.pdf

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Defying Gravity [full] - Olivier Awards 2014 - Willemijn Verkaik. [Online] [Accessed 23rd May 2015.] Available from: https://www.youtube.com/watch?v=wPfETQgvcbw