That is a HUGE question with a H U G E answer! Almost every instrument has been used in every decade, different instruments for different genres.
Is there a specific genre you are asking about?
Popular music? Electric or acoustic guitar, bass, drums, and too much computer processing!
Rock Music? Rock music died just before 2000. Okay, so I'm just kidding. Sort of.
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Frequently used for musical instruments is brass: a copper and zinc alloy.
Whatever instruments are necessary.
What musical instruments are used in bad romance
Commonly, its the piano
piano