The ornamental design for a rack for holdingentertainment media, as shown and described.
FIG. 1 is a front perspective view of a rack for holding entertainment media;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is another front view thereof;
FIG. 4 is an another rear view thereof;
FIG. 5 is a first end view thereof; and,
FIG. 6 is a second end view thereof.
The broken lines showing the stand that protrudes from the back panel used to support the rack and on the top flat surface are included for the purpose of illustrating environment and form no part of the claimed design.