FIG. 1 is a front elevation view of a MIDI keyboard, showing my new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is an enlarged view of detail “7” identified in FIG. 1.
The dashed lines in the figures illustrate portions of the MIDI keyboard that form no part of the claimed design. The dash dot dash lines in FIGS. 1 and 7 are for the purpose of illustrating the enlarged view indicators and form no part of the claimed design.