Vocal Solo,Voice - Level 5 - Digital Download SKU: A0.917259 Composed by Robert Chamberlin. 20th Century. 10 pages. Robert Chamberlin #4767929. Published by Robert Chamberlin (A0.917259). Psalmus, composed for soprano and piano, is based on a Psalm from the Theraveda written by Vimala Thera of RÄ�jagaha.  He wrote the poem after meditation in a mountain cave.  The meditation was interrupted by a severe thunderstorm.  The poem reflects his reaction to the storm.  This composition includes some inside-the-piano technique, like plucking strings and brushing the strings.  Mixed meter and tempo changes contribute to the character of the piece.