Although the score is by Howard Shore, some of the diegetic music (that the characters themselves would be hearing) in the film is not. Most of it was composed by a New-Zealand musician collective known as Plan 9 (Jannet Roddick, David Donaldson, Stephen Roche) and David Longe, known collectively within the context of the Lord of the Rings (and The Hobbit) as "The Elvish Impersonators." They composed several vocal and instrumental pieces as well musical sound effects used for the Ring and Sauron, for the Dead Marshes and for Fangorn. Other musical sound effects, added by the film's sound design department, include war horns and bells ringing. Other film compositions were made by Enya, co-producer Fran Walsh and by the actors Viggo Mortensen and Billy Boyd.