39. The method according to claim 38 , wherein polar coordinates as two-dimensional coordinate values are determined according to r = x 2 + y 2 ( 2 ⁢ a ) ϕ = 1 2 ⁢ π · arctan ⁡ ( y / x ) ( 2 ⁢ b ) where r and φ denote the polar radial and the polar angular coordinate values, respectively, and x and y denote two-dimensional Cartesian coordinate values, according to equations (1a), (1b).
39. The method according to claim 38 , wherein polar coordinates as two-dimensional coordinate values are determined according to r = x 2 + y 2 ( 2 ⁢ a ) ϕ = 1 2 ⁢ π · arctan ⁡ ( y / x ) ( 2 ⁢ b ) where r and φ denote the polar radial and the polar angular coordinate values, respectively, and x and y denote two-dimensional Cartesian coordinate values, according to equations (1a), (1b). 40. The method according to claim 39 , wherein from two-dimensional coordinate values, in normalized form, a color or color values describing a color are generated which are descriptive of the mood of said piece of music or said part thereof.