Some composers have written purely instrumental works bearing the title of "Requiem", as famously exemplified by Britten's "Sinfonia da Requiem". Hans Werner Henze's "Das Floß der Medusa", written in 1968 as a requiem for Che Guevara, is properly speaking an oratorio; Henze's Requiem is instrumental but retains the traditional Latin titles for the movements. Igor Stravinsky's "Requiem Canticles" mixes instrumental movements with segments of the "Introit", "Dies irae", "Pie Jesu" and "Libera me". Christopher Wood’s "Requiem" (premiered in 2012 under the direction of Paul Brough at St John's, Smith Square) was inspired by the public reaction to the death of Queen Elizabeth the Queen Mother, and returns to a more traditional form, setting virtually the complete Latin text from the Liber Usualis. In February 2013, an Arab Spring-inspired Requiem by composer Rami Khalife was premiered by the Qatar Philharmonic Orchestra and the , to great critical acclaim.