Keyboard

FIG. 1 is a front elevational view of a keyboard showing our new design; FIG. 2 is a rear elevational view thereof; FIG. 3 is a left side view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a top plan view thereof; FIG. 6 is a bottom plan view thereof; FIG. 7 is a top, rear and right side perspective view thereof; and, FIG. 8 is a bottom, front and left side perspective view thereof. The claimed design is indicated by the relatively dark portions in the figures. The portions in relatively light, de-emphasized, translucent shading on the center top area of the keyboard form no part of the claimed design.