Final answer:
An mbira is considered a membranophone, which is a type of music instrument that produces sound by vibrating a membrane when it is struck or rubbed.
Step-by-step explanation:
An mbira is indeed considered a membranophone. In the common classification system used in ethnomusicology, membranophones are instruments with a membrane, such as drums. They produce sound by vibrating a membrane when it is struck or rubbed. Examples of membranophones include the djembe, timpani, and conga drums.