I agree, but that’s one case to why do singers wear headphones, there’s another case to consider: live performances. During live performances, singers wear headphones in order to hear themselves better. When they’re on stage, a lot of noises are going on at once very loudly. For instance, the only thing a singer might be able to hear is the crashing of drums behind them and the roar of the crowd over their own voice. Not being able to hear yourself while singing can cause you to sing too loudly or even shout, which affects how your music sounds. The earpieces musicians wear on stage are called in-ear monitors, and it allows them to hear only what they want to hear, for instance their voice and the keyboard. The sound engineer that adjusts the volumes of each instrument during the live show also can change what the singer is hearing in their ear.