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The ornamental design for a musical keyboard, as shown and described.
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FIG. 1 is a top plan view of a musical keyboard showing my new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a front view thereof.
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