Art and Music

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I read recently that whereas a canvas (or presumably paper depending on the medium) is the background on which artists work, musicians work against the background of silence. This made me think for a while. Stretching the analogy a little wider, I thought that a song with one voice or one instrument would be like a pencil drawing, and harmonies between instruments and/or voices would be the colours. Also whereas artists tend to use a static medium (unless they are into performance art) usually in the past, the performance of music uses the dimension of time on which to paint it's picture.