I claim the ornamental design for a sound player, as shown and described.
FIG. 1 is a first perspective view of a sound player according to the new design.
FIG. 2 is a second perspective view thereof showing the design from the front, bottom, and left side.
FIG. 3 is a front elevational view thereof.
FIG. 4 is a rear elevational view thereof.
FIG. 5 is a left side view thereof.
FIG. 6 is a right side view thereof.
FIG. 7 is a top plan view thereof.
FIG. 8 is a bottom plan view thereof.
FIG. 9 is a third perspective view thereof; and,
FIG. 10 is a front elevational view of the sound player according to another embodiment of the new design when a cover of a signal connector thereof is removed.
The broken lines illustrate unclaimed portions and form no part of the claimed design.