FIG. 1 is a perspective front view of a headphone showing my new design;

FIG. 2 is a perspective rear view of a headphone showing my new design;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The portions indicated in broken lines are for illustrative purposes only and form no part of the claimed design. The dot-dash broken lines shown in Drawings define but are not included in, the boundaries of the claimed design.