What's the difference between castrato and contratenor?

Castrato

Definition:

• (n.) A male person castrated for the purpose of improving his voice for singing; an artificial, or male, soprano.

Example Sentences:

• (1) The Raven features a singer, simply called Antony, with a wonderful, shimmering voice - almost castrato.
• (2) The age of the castrato voice is a remarkable episode.

Contratenor

Definition:

• (n.) Counter tenor; contralto.

Example Sentences: