Euphonium,Piano - Level 2 - Digital Download SKU: A0.593315 Composed by William Cowper. Arranged by David McKeown. Christian,Gospel,Praise & Worship,Sacred,Spiritual. Score and part. 4 pages. David McKeown #6418317. Published by David McKeown (A0.593315). There is a Fountain Filled with Blood is a beautiful hymn arranged here for Solo Euphonium and Piano.The words of There is a Fountain Filled with Blood were written by William Cowper in 1772 after a major bout of depression.