The ornamental design for a portablemediaplayer, as shown and described.
FIG. 1 is a top and rear perspective view of a portable media player showing my new design with the pin in a closed position;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a front elevation bottom plan view thereof.
The broken line showing of control buttons and fastening members and holes along with front surface indicia is for illustrative purposes only and forms no part of the claimed design.