Topic summary
Savants

Extracted from the Wikipedia article Savant syndrome.
Musical savants
A musical savant is someone who displays genius musical abilities such as perfect pitch, instant composition, or fluency in multiple instruments, all with no prior experience. Savants commonly share a unique triad of characteristics, those being blindness, mental disability, and musical genius. While this trio of characteristics appears frequently in reports on savants, the cause remains unidentified.