This is the other “Peter” song that is sung at St Peter’s every year celebrating our patron saint.
It is by Andrew Chinn and the sheet music can be purchased as part of the collection “Let Your Light Shine” available at Butterfly Music. The text is also available from his site in this document.
You can listen to an excerpt of the song here. If you like his music please go to his website and purchase his CDs and music books, which are especially good for children but can also work for adults.