Individuals with unilateral or asymmetric hearing loss are subjects who have one ear with normal hearing sensitivity or with mild hearing loss and the other with permanent medium or severe sensorineural hearing loss

The use of sound and music as a therapeutic medium has very ancient origins that are rooted in the culture and tradition of primitive populations.

The ear canal is a small canal, forming part of the outer ear, which connects the auricle with the middle ear, ending at the level of the tympanic membrane.