B-Flat Trumpet,Piano - Level 5 - Digital Download SKU: A0.1488907 By Kevin Birch. By Kevin Birch. Chamber,Christian,Classical,Traditional. Score and part. 21 pages. Birch Music Online #1065763. Published by Birch Music Online (A0.1488907). I Once Was Lost is a set of variations on Amazing Grace with the title being taken from the third line of the first verse of the hymn.Although this piece was originally written for Trumpet and Piano it would work equally well on other Bb Valved instruments.The full melody only appears following the variations but does give the performer the option to sing a part of the melody if possible.