I learned this song from Debbie Lou Ludolph at Music that Makes Community in Minneapolis in 2014.
Sheet music can be found in Singing In Community, our latest songbook published by Augsburg Fortress. It is also published in Sing With the World, a collection edited by John Bell and Alison Adam of the Iona Community in Scotland and published by GIA Publications, Inc. It is available as a CD, download and book at the link above.
Here's a video of Debbie Lou leading this Alleluia at Music that Makes Community at the Bishop's Ranch in January of 2015.