Katy Perry Debuts 'By the Grace of God' at iTunes Festival [VIDEO]

Katy Perry debuted a new song, By the Grace of God at the iTunes Festival, Just Jared reported Monday.

The 28-year-old Roar singer was the final performer at the iTunes Festival that was held at The Roundhouse on Monday, Sept. 3 in London, England. She belted out many of her hits. During the event, she revealed the new song, By the Grace of God. It is to be featured on her new album, Prism.

Prior to her performance, she teased the song on Twitter.

You want another shade of #PRISM? Let's take WALKING ON AIR to the TOP spot & in exchange, I'll play a NEW song you've never heard tonight!

— Katy Perry (@katyperry) September 30, 2013

By the Grace of God is about the difficulties that she has faced. She recently revealed in Billboard magazine that she contemplated suicide after her marriage to comic Russell Brand ended in 2012. She found herself lying on the floor, fighting suicidal thoughts.
"That song is evident of how tough it really was at a certain point. I asked myself, 'Do I want to endure? Should I continue living?'" Perry said. "All the songs are real-life moments. I can only write autobiographically. I put all the evidence in the music. I tell my fans if they want to know the real truth about stuff, just listen to the songs."

Watch the performance below.