7. 'The Edge of Glory' - Lady Gaga, 'Nationals'
With New Directions finally on the national stage of their glee choir competition in penultimate third season episode 'Nationals', the previous division of former rival all-female group the Troubletones get their turn, means that they finally get a chance to shine in their own number, taking on the modern classic 'Edge of Glory'. While the original definitely has the most life-affirming power, it's still a gorgeous twist to hear the different voices and types of voices belting out the lyrics - making the anthemic chorus that much more epic with a whole host of well-harmonising voices. It was also all the more effective for a sign that the Troubletones plot wasn't going to be magically forgotten in time for the competition - all the female voices bar Lea Michele's get great moments to standout here and it feels like a great conclusion to the Troubletones storyline in a rocky third season.