Lady Gaga has once again proved that her voice is strong enough to fill an entire arena even without a microphone.

On Thursday night, Gaga and Tony Bennett brought their Cheek to Cheek world tour to Concord, CA where they sang over 20 jazz standards at a sold-out show at Concord Pavilion.

Among the best moments of the night was Gaga's emotional rendition of Cher's "Bang Bang (My Baby Shot Me Down)," towards the end of which she went mic-less, filling the arena with her massive pipes. As soon as the performance ended, the audience rose up in an immediate standing ovation.

Have you attended the Cheek to Cheek tour yet? Share your concert experience in the comments below!