Keyboard

FIG. 1 is a perspective view of a keyboard showing our new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a left side elevation thereof; and,

FIG. 8 is a right side elevation view thereof.

The broken lines depict portions of the keyboard in which the design is embodied that form no part of the claimed design.