Instrumental Duet,Piano C Instrument - Level 2 - Digital Download SKU: A0.880983 Composed by Ben Fielding and Reuben Morgan. Arranged by Marco Polo C. Ignacio. Contemporary. Lead Sheet / Fake Book. 2 pages. MARCO POLO IGNACIO #6362985. Published by MARCO POLO IGNACIO (A0.880983). Who You Say I Am is a song performed by Australian praise and worship group Hillsong Worship. Written by Reuben Morgan and Ben Fielding, a studio-recorded version of the song was released on 15 June 2018 as the first single from their 26th live album, There Is More (2018), by Hillsong Music Australia and Capitol Christian Music Group. It appeared on the compilation album Wow Hits 2019.