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Prepackaged computer software and downloadable computer software for composing, performing, publishing, arranging, and printing in the field of music, music notation, music publishing, music distribution, music education, music practice, music performance, music accompaniment, music recording, music performance assessment, and music theory assessment; downloadable audio, image and text files in the field of music, music notation, music publishing, music distribution, music education, music practice, music performance, music accompaniment, music recording, music performance assessment, and music theory assessment; downloadable electronic data files featuring music notation, music publishing, music distribution, music education, music practice, music performance, music accompaniment, music recording, music performance assessment, and music theory assessment; downloadable electronic data files featuring music accompaniments; downloadable computer software for composing, performing, publishing, arranging, and printing featuring music accompaniments; pre-recorded music recorded on optical media; pre-recorded music accompaniments recorded on optical media