While Katy Perry's hit single "Roar" holds it down on the top Hot 100, other tracks from her upcoming album, "Prism," continue to surface. Two songs, "Unconditionally" and "Birthday" were finally leaked online this week, after her appearance on "Saturday Night Live" performing "Roar" and the new dance song "Walking On Air" last weekend.

"Unconditionally" will be the next single off "Prism." In the power ballad, Katy Perry proclaims her unconditional love, singing along with echo-effect keyboard sounds and big drums, with synth for the chorus.

"Oh no, did I get too close? / Oh, did I almost see what's really on the inside? / All your insecurities / All the dirty laundry / Never made me blink one time."

The four-minute track is one of four songs that are produced by Dr. Luke, who has worked with Kelly Clarkson and Rihanna, and Cirkut, who has working with Britney Spears and Taylor Swift. On "Prism," including "Roar," they worked with Max Martin.

The other track, "Birthday," has a funky R&B Whitney Houston-sound with classic eighties twist. In the upbeat track, Katy Perry sings a catchy tune.

"But when you're with me / I'll give you a taste / Make it like your birthday everyday / I know you like it sweet / So you can have your cake / Give you something good to celebrate."

Following her hit single "Roar" and her collaboration with Juicy J on "Dark Horse," Kate Perry's fourth studio album "Prism" is set for release on October 22. She will also perform "Unconditionally" at this year's MTV Europe Music Awards on November 10.