Opus 38, subtitled Psalm for baritone, large mixed chorus and grand orchestra, is a musical psalm setting written by Henryk Mikołaj Górecki in 1979 . The text is drawn from several psalms (143:1,6-10; 31:16; 88:2; 67:7; 34:9) and the title is from the last of these: "Blest is the man that trusteth in Him". The work was premiered on June 9, 1979 in Kraków, Poland with Baritone Jerzy Mechlinski and the Kraków Philharmonic Orchestra and Chorus, conducted by the composer. --Wikipedia
It was commissioned by Pope Saint John Paul the Great when he was a Cardinal. It was to commemorate the 900th anniversary of the martyrdom of St. Stanislaw.
I find it a powerful piece of music.