Beatus Vir 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.
Beginning in the late 1960s and early 1970s, Górecki began to compose larger scale works. At the same time, his music became both harmonically and melodically simpler in his writing than his previous serial compositions. Three primary musical influences also became apparent in his compositional style: Polish folksong, Catholic chant and the Polish music of the past, primarily the works of Karol Szymanowski. Out of these influences evolved two compositional kernels in Górecki's music: Górecki's "motto" motif (a rise of a minor third, usually on the first three pitches of the Aeolian or Dorian scales); and the "Skierkowski turn" (the Górecki motto followed by a descending half-step) named for the Polish folk music collector who influenced the music of Karol Szymanowski. Górecki's motto and turn are found throughout the Beatus Vir Psalm. Two examples are in the baritone in the Lento section beginning at measure 123 and in the final Molto Lento section in the upper instruments of the orchestra beginning in measure 541. The repetitive nature of the melodic writing throughout the Beatus Vir Psalm is a direct descendent of the chant-like responses sung in Catholic churches.