A film score (also sometimes called background music or incidental music) comprises all original music written specifically to accompany a film. The score forms part of the film's soundtrack, which also usually includes dialogue and sound effects, and comprises a number of orchestral, instrumental or choral pieces (“cues”) which are timed to begin and end at specific points during the film in order to enhance dramatic narrative and emotional impact of the respective scene. Scores are written by one or more composers, under the guidance of the film's director and/or producer, and are then usually performed by an ensemble of musicians. Most often, the performance comprises an orchestra or band, instrumental soloists, and choir or vocalists, and is recorded by a sound engineer. However, since the invention of digital technology and audio sampling, many low budget films have since been able to rely on digital samples to imitate the sound of live instruments, and many scores are created and performed wholly by the composers themselves.