To blare means to crank up the volume — really LOUDly. Blare is what you do with your dance music if you want your neighbors to hate you.
The verb blare has ties to the Middle Dutch word bleren, meaning "to bleat, cry, bawl, shout." Blare describes a loud, harsh, unpleasant sound, something you associate with car horns on a busy city street at rush hour, sirens on a police car, or even music played at an unnecessarily high volume. A club is allowed to blare its dance music. But if you blare music at home? Your neighbors would probably consider that too loud.