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Other works in the late 19th, 20th and 21st centuries have fused other disciplines in unique and creative ways, such as performance art. Performance art is a performance over time which combines any number of instruments, objects, and art within a predefined or less well-defined structure, some of which can be improvised. Performance art may be scripted, unscripted, random or carefully organized; even audience participation may occur. John Cage is regarded by many as a performance artist rather than a composer, although he preferred the latter term. He did not compose for traditional ensembles. Cage's composition "Living Room Music" composed in 1940 is a "quartet" for unspecified instruments, really non-melodic objects, which can be found in a living room of a typical house, hence the title.