I would think that most Requiems which are based on the Catholic "Mass for the Dead" would have at least one "Dies irae" - Gabriel Faure's is the most notable exception. The one which is included in a Requiem that I feel is the most dramatic is Hans Werner Henze's - it contains a virulent mixture of trumpet, strings, thunderous drums and whips. For those musical pieces which are based on the mediaeval plainchant the most dramatic would be Berlioz' Witches' Sabbath from the "Symphonie Fantastique" or Saint-Saens' "Danse Macabre". If you want to wallow in the "Dies irae" spend Halloween listening to Sergei Rachmaninov. He seems to get the plainchant into all of his pieces somewhere - most nakedly the "Symphonic Dances", "The Isle of the Dead", and "Rhapsody on a Theme of Paganini". Regards ...Alex Soteros Toronto