Keyboard

FIG. 1 is an upper front perspective view of a keyboard, showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof; and,

FIG. 7 is a bottom view thereof.

The portions of the keyboard shown in broken lines form no part of the claimed design.