Small woodwind in a military band

FIFE

This high-pitched instrument often pairs with a drum in traditional parades and has six finger holes but no keys.

This clue points to a "fife," a small, high-pitched woodwind instrument often used in military or marching bands. The word "military band" narrows it down, as fifes are traditionally paired with drums in ceremonial or parade music. There’s no wordplay here—it’s a straightforward definition, relying on the instrument’s size and its classic role in military settings.