The ornamental design for a drum, as shown and described.
FIG. 1 is a perspective view of a drum showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is another side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a bottom perspective view thereof.
The broken lines showing the drum are included for the purpose of illustrating portions of the article and form no part of the claimed design. Non-oblique line shading is meant to show contour and not surface ornamentation.