Katy Perry's LP 'delayed' by Ryan Tedder

Ryan Tedder has revealed that he is responsible for delaying Katy Perry's new album.

The OneRepublic singer, who has penned three tracks for Perry's sophomore LP, admitted that his own band's success has meant that he is yet to record with Perry in the studio.

He told MTV: "She and I have actually been trading text messages for, like, the last five months about this album, trying to lock our schedules in.

"I have three songs that I think are dead-on, incredible songs for her that are just started, they're ideas that I want to finish with her.

"So, literally, in the next three days, I travel with a microphone and studio stuff, so I'm going to be trading emails with her and hopefully get one of them on the album at the last minute."

Tedder continued: "I'm literally the last guy to come on board, and I was one of the first people she talked to [about working on the album]. That's what happens when you're in a band."

The singer-songwriter also revealed what to expect from Perry's new album, which is due out later this year.

"The stuff that I'm doing for Katy Perry... it connects to the first album," he explained.

"One song is, like, the evolution of 'Hot N Cold,' that kind of thing. The next step from that. The other two literally sound like something you would hear in the mid-'90s at a roller-rink skating party - like, a birthday party at a skating rink.

"I would describe it as guilty-pleasure music, straight up. I've had the melodies and the choruses in these songs stuck in my head for, like, a week. So I feel really good about it, and Katy, I hope you like it."