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A performance can either be rehearsed or improvised. Improvisation is a musical idea assumed on the spot (such as a guitar solo or a drum solo), with no prior premeditation, while rehearsal is hale repetition of an idea until it has achieved cohesion. Musicians will generally add improvisation to a well-rehearsed idea to http://www.audiosparx.com/ design a unique performance.
The field of music cognition involves the cogitation of lousy with aspects of modern including how it is processed by listeners. Rather than accepting the standard practices of analyzing, composing, and performing rock as a given, much research in music cognition seeks instead to uncover the mental processes that underlie these practices. Also, research in the patch seeks to uncover commonalities between the musical traditions of disparate cultures and possible cognitive "constraints" that limit these musical systems. Questions regarding musical innateness, and emotional responses to music are also leading areas of research in the field.