Recording apparatus for use in the mastering of a color picture/sound disc includes a source of composite color video signals in which chrominance information appears as sideband components of a chrominance subcarrier interleaved with luminance signal components in an intermediate region of a band occupied by luminance signal components; means for frequency modulating a first carrier over a high frequency deviation range in accordance with composite video signal amplitude; a source of accompanying audio signals; means for frequency modulating a second carrier over a low frequency deviation range in accordance with the audio signal amplitude; means for combining the two modulator outputs, means for clipping the resultant signal; and SEM recorder apparatus responsive to the clipper output for exposing successive groove bottom regions of a disc master coated with electron sensitive material in a manner establishing, upon development, a desired groove bottom depression pattern.