Sound art is a diverse group of art practices that considers wide notions of sound, listening and hearing as its predominant focus. There are often distinct relationships forged between the visual and aural domains of art and perception by sound artists.

Like many genres of contemporary art, sound art is interdisciplinary in nature, or takes on hybrid forms. Sound art often engages with the subjects of acoustics, psychoacoustics, electronics, noise music, audio media and technology (both analog and digital), found or environmental sound, explorations of the human body, sculpture, film or video and an ever-expanding set of subjects that are part of the current discourse of contemporary art.

From the Western art historical tradition early examples include Luigi Russolo's Intonarumori or noise intoners, and subsequent experiments by Dadaists, Surrealists, the Situationist International, and in Fluxus happenings. Because of the diversity of sound art, there is often debate about whether sound art falls within the domain of either the visual art or experimental music categories, or both. Other artistic lineages from which sound art emerges are conceptual art, minimalism, site-specific art, sound poetry, spoken word, avant-garde poetry, and experimental theatre.

Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations.

Sound is a sequence of waves of pressure that propagates through compressible media such as air or water. (Sound can propagate through solids as well, but there are additional modes of propagation). During propagation, waves can be reflected, refracted, or attenuated by the medium.

The behavior of sound propagation is generally affected by three things:

When sound is moving through a medium that does not have constant physical properties, it may be refracted (either dispersed or focused).

The perception of sound in any organism is limited to a certain range of frequencies. For humans, hearing is normally limited to frequencies between about 20 Hz and 20,000 Hz (20 kHz), although these limits are not definite. The upper limit generally decreases with age. Other species have a different range of hearing. For example, dogs can perceive vibrations higher than 20 kHz, but are deaf to anything below 40 Hz. As a signal perceived by one of the major senses, sound is used by many species for detecting danger, navigation, predation, and communication. Earth's atmosphere, water, and virtually any physical phenomenon, such as fire, rain, wind, surf, or earthquake, produces (and is characterized by) its unique sounds. Many species, such as frogs, birds, marine and terrestrial mammals, have also developed special organs to produce sound. In some species, these produce song and speech. Furthermore, humans have developed culture and technology (such as music, telephone and radio) that allows them to generate, record, transmit, and broadcast sound. The scientific study of human sound perception is known as psychoacoustics.

Art is a term that describes a diverse range of human activities and the products of those activities, but is most often understood to refer to painting, film, photography, sculpture, and other visual media. Music, theatre, dance, literature, and interactive media are included in a broader definition of art or the arts. Until the 17th century, art referred to any skill or mastery and was not differentiated from crafts or sciences, but in modern usage the fine arts are distinguished from acquired skills in general.

Many definitions of art have been proposed by philosophers and others who have characterized art in terms of mimesis, expression, communication of emotion, or other values. During the Romantic period, art came to be seen as "a special faculty of the human mind to be classified with religion and science".

The nature of art, and related concepts such as creativity and interpretation, are explored in a branch of philosophy known as aesthetics.

The Encyclopædia Britannica Online defines art as "the use of skill and imagination in the creation of aesthetic objects, environments, or experiences that can be shared with others". By this definition of the word, artistic works have existed for almost as long as humankind: from early pre-historic art to contemporary art; however, some theories restrict the concept to modern Western societies. The first and broadest sense of art is the one that has remained closest to the older Latin meaning, which roughly translates to "skill" or "craft." A few examples where this meaning proves very broad include artifact, artificial, artifice, medical arts, and military arts. However, there are many other colloquial uses of the word, all with some relation to its etymology.

Todd Selby is a photographer, blogger and fashion celebrity. His work represents neighborhoods like Brooklyn and Silver Lake. He lives in an apartment in NYC, although he has not featured it on his site.

Todd's photography is featured on his website TheSelby.com and often portrays the homes of prominent indie musicians, artists, designers, and actors. The purpose of The Selby is to capture interesting people in their creative spaces. He sells some art, limited edition clothing and jewelry on his site. However, the main purpose of the site is to distribute his work as widely as possible.