Answer:Drummers can use both sheet music and memorization, depending on the context. In formal settings, such as orchestras and band performances, drummers often read sheet music to follow complex rhythms and arrangements accurately. In other situations, like improvisational performances or jam sessions, drummers may rely on memorized rhythms and patterns. Many skilled drummers combine both approaches, using sheet music as a guide while also developing their ability to play by ear and memorize different grooves and fills.