The Lacrimosa (Latin for "weeping/tearful"), is part of the Dies Irae sequence in the Catholic Requiem Mass. Its text comes from the Latin 18th and 19th stanzas of the sequence. Many composers, including Mozart, Berlioz, and Verdi have set the text as a discrete movement of the Requiem. Text. See also. Dies irae. Requiem (Berlioz) Requiem (Dvořák) Requiem (Ligeti) Requiem (Mozart) Requiem (Verdi) References.
https://en.wikipedia.org/wiki/Lacrimosa