The ornamental design for a soundholecover for guitar, as shown and described.
FIG. 1 is a top perspective view of a soundhole cover for guitar, showing
my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof, the rear view, the right side view and the
left side view being identical; and,
FIG. 5 is a reduced top view of the soundhole cover being installed on a
guitar, the broken lines are shown for illustrative purposes only and form
no part of the claimed design.