Paper, books or canvases of sorts are labeled in size with A1, A2, A3 etc (the bigger the number the smaller the object) a4 paper is the standard size
A membranophone, it's sort of in the name. A membranophone is any musical instrument that produces sound with a vibrating stretched membrane. An idiophone is somewhat similar and produces sound by vibrating when hit but does not use strings or membranes (the instrument as a whole vibrates).
It is not okay. Unless the artist learned about the culture but if they don’t they are doing cultural appropriation. It definitely matters what race is involved a white artist can’t do a Chicana (Mexican culture) music. Even if credit is given they should respect the culture
