Musicians usually use little earpieces, known as In-Ear Monitors or IEMs for short. These earpieces help the singers perform better, as they can use them to hear all the instruments being played as well as their own vocals. IEMs also block any background noise, like the crowd so that they can stay focused and in tune with the band. That said, musicians may use a variety of headphones, including in-ear monitors, over-ear headphones, and noise-canceling headphones, depending on their personal preference and the type of performance. Some popular brands used by musicians include Shure, Sennheiser, Westone, and Bose.