Final answer:
The cornetto and sackbut are both brass instruments that produce sound by buzzing the player's lips into a cup-shaped mouthpiece and resonating vibrations through tubes.
Step-by-step explanation:
The cornetto and sackbut are both brass instruments. Brass instruments, such as trumpets and trombones, produce sound by buzzing the player's lips into a cup-shaped mouthpiece, which creates vibrations that travel through the instrument's tubes and resonate to produce sound.