||This article is in a list format that may be better presented using prose. (December 2012)|
Foley is the reproduction of everyday sound effects which are added in post production to enhance the quality of audio for films, television, video, video games and radio. These reproduced sounds can be anything from the swishing of clothing and footsteps to squeaky doors and breaking glass. The best foley art is so well integrated into a film that it goes unnoticed by the audience. It helps to create a sense of reality within a scene. Without these crucial background noises, movies feel unnaturally quiet and uncomfortable.
Foley artists look to recreate the realistic ambient sounds that the film portrays. The props and sets of a film do not react the same way acoustically as their real life counterparts. Foley sounds are used to enhance the auditory experience of the movie. Foley can also be used to cover up unwanted sounds captured on the set of a movie during filming, such as overflying airplanes or passing traffic.
The term "Foley" is also used to describe a place, such as Foley-stage or Foley-studio, where the Foley process takes place.
History of Foley 
Jack Donovan Foley (1891-1967) began what is now known as Foley art in 1927. He had started working with Universal Studios in 1914 during the silent movie era. When Warner studios released its first film to include sound, The Jazz Singer, Universal knew it needed to get on the bandwagon and called for any employees who had radio experience to come forward. Foley became part of the sound crew that would turn Universal’s then upcoming “silent” musical Show Boat into the musical that it is known as today. Because the microphones used for filming could not pick up more than dialogue, other sounds had to be added in after the film was shot. Foley and his small crew would project the film on a screen while recording a single track of audio that would capture their live sound effects in real time. Their timing had to be perfect so that footsteps and closing doors would sync with the actors' motions in the film. Jack Foley created sounds for films until his death in 1967. His methods are still employed today.
Modern Foley art has progressed as recording technology has progressed. Today, sounds do not have to be recorded live on a single track of audio. They can be captured separately on individual tracks and carefully synced with their visual counterpart. Foley studios employ hundreds of props and digital effects to recreate the ambient sounds of their films.
The purpose of Foley is to complement or replace sound recorded on set at the time of the filming (known as field recording). The soundscape of most films uses a combination of both. A Foley artist is the person who creates this sound art. Foley artists use creativity to make viewers believe that the sound effects are actually real. The viewers should not be able to realize that the sound was not actually part of the filming process itself. Foley sounds are added to the film in post production after the film has been shot. The need for replacing or enhancing sounds in a film production arises from the fact that, very often, the original sounds captured during shooting are obstructed by noise or are not convincing enough to underscore the visual effect or action. For example, fist-fighting scenes in an action movie are usually staged by the stunt actors and therefore do not have the actual sounds of blows landing. Crashes and explosions are often added or enhanced at the post-production stage. The desired effect is to add back to the original soundtrack the sounds that were intended to be excluded during recording. By excluding these sounds during field recording, and then adding them back into the soundtrack during post-production, the editors have complete control over how each noise sounds, its quality, and the relative volume Foley effects add depth and realism to the audio quality for multimedia sources, and they simplify the synchronizing of sounds that would otherwise be tedious or downright impossible to manage.
The Foley artist reviews the film as it runs to figure out what sounds are needed to achieve the desired sound and results. Once the material is gathered and prepared to be used, the Foley artist practices the sounds. When the desired sound is accomplished, it is the Foley artist's task to watch the film and add in the sound effects at the same time. This is similar to when actors have to add dialogue over the movement of the lips in filming.
Scenes where the dialogue is replaced using dubbing will also have to feature Foley sounds. Automatic dialogue replacement (ADR) is when voice sounds are recorded in post production. This is done by a machine that runs the voice sounds with the film forward and backward to get the sound to run with the film. The objective of the ADR technique is to add sound effects into the film after filming, so the voice sounds are synchronized. Not only are many of the sounds not added at the time of filming, the microphones may not capture the sound the same way the audience would predict to hear. The need for Foley rose dramatically when films began to be distributed internationally and dubbed in foreign languages. As dialogue is replaced, all sound effects recorded at the time of the dialogue are lost as well.
How Foley is created 
Foley is created by the sound artist mimicking the actual sound source in a recording studio. Often there are many little sound effects that happen within any given scene of a movie. The process of recording them all can be tedious and time consuming. Foley art can be broken down into three main categories: Feet, Props, and Cloth.
To illustrate these categories, we will use the following example:
- Two actors are walking down a marble staircase in a film, having a discussion while fishing in their pockets for their car keys.
The “Feet” category entails the sound of footsteps. In the example given the actors are walking down a staircase. What the audience hears are two Foley artists stamping their feet on a marble slab in a recording studio, which they do while watching the footage to make sure that their foot strikes happen at the same time as the actor’s steps on the screen. Foley studios carry many different types of shoes and several different types of floors to create footstep sounds. These floors vary from marble squares to gravel and rock pits. Creating just the right sound of footsteps can greatly enhance feel of a scene.
The “Cloth” category makes up many of the more subtle sounds heard in films. Foley artists will have to add the swishing of clothing as the actor’s pant legs rub together as they descend the stairs. This sound is created by rubbing two pieces of the same material together near the microphone at the same rate that the actor’s legs cross. Cloth is not always used and tends to be recorded at the discretion of the dubbing mixer who ultimately controls the final outcome of the audio post-production process.
Other effects 
Foley can also include other sounds such as doors closing and doorbell rings, however these tend to be done more efficiently using stock sound effects, arranged by "tracklayers".
The scene is only complete when a little reverb is added onto the new Foley audio and any dialog recorded at the set in order to recreate the sound of the hard, empty walls of the staircase. Reverb and echo can enhance the feeling of space in a scene. Both of these effects are subtle but descriptive to the human ear. Acoustically, these effects are how we judge the size of a given space. For example, a large hall will have strong reverberation, while a small room may have only slight reverberation. Open outdoor spaces usually have no echo/reverb at all.
Common Foley tricks 
- Corn starch in a leather pouch makes the sound of snow crunching
- A pair of gloves sounds like bird wings flapping
- An arrow or thin stick makes a whoosh
- An old chair makes a controllable creaking sound
- A water soaked rusty hinge when placed against different surfaces makes a creaking sound. Different surfaces change the sound considerably
- A heavy staple gun combined with other small metal sounds make good gun noises
- A metal rake makes a fence sound (it can also make a metallic screech when dragged across a piece of metal)
- A heavy car door and fender can create most of the car sounds needed but having a whole car in the studio is better
- Burning plastic garbage bags cut into strips makes a cool sound when the bag melts and drips to the ground
- ¼” audio tape balled up sounds like grass or brush when walked on
- Gelatin and hand soap make squishing noises
- Frozen romaine lettuce makes bone or head injury noises
- Coconut shells cut in half and stuffed with padding makes horse hoof noises
- Cellophane creates crackling fire effects
- A selection of wooden and metal doors are needed to create all sorts of door noises but also can be used for creaking boat sounds
- A heavy phone book makes body-punching sounds
A list of vocabulary words:
- Cue sheet: A list of the necessary sound effects, along with their cues. Cues are either time code signals or film footage signals (such as the slate) that indicate when the sound begins and ends.
- Dialogue: Conversation or verbalizations in a film.
- Echo chamber: A box or container used to create illusion of distance and reverberation.
- Incidental: Casual, everyday sounds that aren't necessarily special.
- Mixing console: A machine that is capable of taking in different sounds, then mixing them at different levels to create a single sound.
- Reverberation: A reechoed sound which fades until it becomes inaudible.
- Rough cut: The first draft of a film.
- Score: The background music throughout a film.
- Splash tank: A container filled with water for wet sound effect.
- Walla: Background crowd noises in a movie, TV or radio.
- "Stinson, Jim. "Real-time Sound Effects: The Foley Way." Videomaker Jul 1999 Web.10 Jul 2009". Videomaker.com. 1999-07-01. Retrieved 2010-05-20.
- Singer, Philip R. "Art Of Foley." Marblehead Publishing Co. Web. 1 July 2010. <http://www.marblehead.net/foley/>
- Considered, All Things. "Jack Foley: Feet to the Stars: NPR." NPR : National Public Radio : News & Analysis, World, US, Music & Arts : NPR. Mar.-Apr. 2000. Web. 2 July 2010.
- Bloom, Leslie. "YouTube - Leslie Bloome - Foley Artist." YouTube - Broadcast Yourself. Nov.-Dec. 2009. Web. 1 July 2010. <http://www.youtube.com/watch?v=wx32-L9tJcE&feature=related>.
- Sound Ideas. "What is Foley? by Skevos Mavros". Sound Ideas. Retrieved 2010-05-20.
- Sound Ideas. "Mavros, Skevos. "Sound Ideas — What is Foley?." MavArt Productions 2000 Web.10 Jul 2009". Sound-ideas.com. Retrieved 2010-05-20.
- Pramaggiore, Maria, and Tom Wallis. Film: A Critical Introduction. 2 ed. London: Laurence King Publishing Ltd., 2008. Print.
- ""Movie Sound Effects; What is a Foley Studio?." Newtons Apple Web.10 Jul 2009". Filmsound.org. Retrieved 2010-05-20.
- O'Connell, Dan. "Dan O'Connell One Step Up Foley Sound Effects at Sounddogs.com." Download Sound Effects | SoundDogs.com. Web. 2 July 2010. <http://www.sounddogs.com/suppliers/2.htm>.