If you're a fan of live music, you probably know that sound can make or break a show. From poor mixes to full-blown technical disasters, some sound issues are enough to make musicians storm off during live performances , causing their concerts to devolve into chaos . Unless they're lip-syncing like Ashlee Simpson on "SNL" circa 2004 (sorry, too soon?), it's next to impossible for singers to put on a good-sounding show if they can't hear themselves onstage.

This is where the earpiece comes in. Maybe you've seen your favorite artist rocking one at a concert before and mistook it for a hearing aid or a Bluetooth earbud. Though similar in size, that tiny device nestled inside their ear is actually an in-ear monitor (IEM) that allows them to hear themselves clearly. If it weren't for th

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