The ornamental design for a musicstaff, as shown and described.
FIG. 1 is a front elevational view of a music staff showing my new design; and,
FIG. 2 is an enlarged-scale elevational view of detail II-II in FIG. 1.
The music staff has no appreciable thickness.
The dash-dot-dot-dot-dash lines represent boundaries that form no part of the claimed design. The dash-dot-dot-dash lines represent phantom lines through the middle of the score and form no part of the claimed design. The dash-dot-dash lines represent circumscribed detail 2-2 from FIG. 1, which is shown on an enlarged scale in FIG. 2. All other broken lines in the drawing represent environmental subject matter and/or portions of the design that form no part of the claimed design.