The all-girls show choir, The Troubletones, will go against the New Directions in a friendly competition in the all-new “Mash Off” episode airing Thursday, Nov. 17th (9:00 PM) on SKY ONE. Check out The Troubletones’ debut performance, a mash up of Adele’s ‘Rumour Has It’ and ‘Someone Like You’ from her album 21 (the biggest selling album in the world this year) on Youtube. The performance also marks Glee’s 300th musical performance.

Adele Mash Off is featured on Glee, The Music: Volume 7 – released 5th December

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