Requiems September 11 Terrorist Attacks, 2001 Brass quartets (Horns (4)) 2 Horns (4) with orchestra 2 Orchestral music 2 Percussion ensembles 2 Quartets (Bassoon, oboe, guitar, viola) 2 plus ... Violin and viola music, Arranged 2 Choruses, Secular (Mixed voices) with harp ensemble 1 Choruses, Secular (Mixed voices) with instrumental ensemble 1 Remixes 1 Vocal ensembles with instrumental ensemble 1 Vocal ensembles, Unaccompanied 1 Vocal music 1 moins ...