Western musical notation is a fairly complex symbolic language that you need to understand to read first if you hope to write it. Just as you couldn't hope to write a novel without understanding to read words and sentences, you can't write sheet music if you can't read notes and rests. Before you try to write down sheet music, develop a working knowledge of:
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Different notes and rests.
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The lines and spaces on the sheet.
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Rhythm markers.
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Dynamic markers.
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Key signatures.