Karaoke Senshi Mike Jirou(1993)

Karaoke Senshi Mike Jirou

In search of his missing parents, Jiro Suzuki attended an a-capella school, hoping to learn the ways of karaoke, even though he's hopelessly tone-deaf. It turned out his true musical abilities were being inhibited by the collar placed on him when he was a child.

(Source: Wikipedia, translated)