Denise Levertov wrote two of them and a psalm, while Aaron Copland composed several, one of which was in memory of Igor Stravinsky.  
The 16th-century Polish poet Jan Kochanowski wrote a group of 19 of these, which concern his daughter Orszula.  Peter Maxwell Davies wrote one (*) "on a plainsong for Michael Vyner," while Ruth Tomalin wrote one "for dormice."  Denise Levertov wrote two of them and a psalm, while Aaron Copland composed several, one of which was in memory of Igor Stravinsky.  Rupert Brooke's "The Funeral of Youth" is one, and Dorothy Parker's begins "Lilacs blossom just as sweet / Now my heart is shattered."  More notable ones include a poem written in 1846 about its author's son Waldo, and a modern one about the victims of Hiroshima.  FTP, identify this term referring to works by Emerson and Penderecki, which describes a poem or song of lamentation.
The 16th-century Polish poet Jan Kochanowski wrote a group of 19 of these, which concern his daughter Orszula.  
threnody (accept "Treny" or "Laments" prior to the asterisk)