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A composer (Latin compÅnÅ; literally one who puts together) is a person who creates or writes music, which can be vocal music (for a singer or choir), instrumental music (e.g., for solo piano, string quartet, wind quintet or orchestra) or music which combines both instruments and voices (e.g., opera or art song, which is a singer accompanied by a ...
Probably this combination of composer and performer in one person is the most fruitful and yields the highest artistic achievements. The author then is an actor playing the main character in the drama written by him. However, the composer is not always a perfect instrumentalist.