A new clinical trial of five children with inherited deafness found administering gene therapy in both ears led to restored hearing and speech, and additional gains including sound source localization, ability to hear in noisy environments, and for two children, abillity to appreciate music. This is the first trial in the world to treat children with hereditary deafness in both ears with gene therapy. The investigators say their findings warrant larger international trials, and suggest this approach may be beneficial for other genetic and non-genetic causes of deafness.