Lamentatio Jeremiae Prophetae by the Canadian composer Peter-Anthony Togni (born 1959) is a concerto for bass clarinet and choir on texts from the Book of Lamentations. The work runs to about 55 minutes in five movements. The bass clarinet takes the voice of the prophet Jeremiah, while an a cappella choir sings the crowd scenes and a solo soprano stands apart from both. Written parts and the soloist's improvisations share the same space, which makes this one of the more unusual sacred works in the ECM New Series catalogue.

The idea came from the bass clarinettist Jeff Reilly, who asked Togni for a concerto in which dramatic events would be carried by the soloist's improvisations. The composer has called the result a direct expression of his Roman Catholic faith. Commissioned by the Canada Council for the Arts for its 50th anniversary, the work was premiered in Toronto in 2007 by the performers heard here. They are the Elmer Iseler Singers under Lydia Adams, with Rebecca Whelan as soprano soloist. The recording was made in October 2008 at the Cathedral Church of All Saints in Halifax, Nova Scotia, with Keith Horner as recording producer and author of the liner notes. Togni studied organ and composition in Canada and at the Schola Cantorum in Paris. Reilly has worked with Jerry Granelli and with the duo of Barry Guy and Maya Homburger.

The first movement, Quomodo sedet sola civitas, sets the opening lament over almost fifteen minutes, with the clarinet speaking against restrained choral writing. At the centre stands the six-minute Silentio, followed by the twelve minutes of Quomodo obscuratum est aurum. The closing Recordare, Domine is the longest movement, and here Reilly uses multiphonics before his improvised cries rise over almost silent voices.

Norman Lebrecht found it “by some measure the most original and affecting” of all the recorded offerings for Holy Week that had come his way. Andy Gill wrote in The Independent that the piece “blends sacred choral music, classical concerto form and jazz improvisation.” In Choir & Organ Shirley Ratcliffe praised Reilly's improvisatory, virtuosic playing, and Dominy Clements of MusicWeb International noted the “sometimes chilling starkness” of the solo lines.

CD, ECM New Series 2129, released on 16 November 2009, with liner notes by Keith Horner.