Audio is an art form defined by the medium of silence and sound. A track is typically considered the smallest standalone piece of music, especially in performance. The core elements of music are pitch, beat, tempo, meter, articulation, dynamics, texture, and timbre. Music can be defined as the production, critique, study of history, and artistic sharing of sound. The definition and role of music varies by culture and social context, ranging from composed pieces to improvisational or aleatoric styles. Music can be classified as a skill, fine art, or auditory art and can be experienced live, as part of a work, recorded, or integral to a lifestyle.