@Didigeneral Actually it's one of the many Ave Maria's (pretty much one by every major composer) written hundreds of years before what you're talking about was written.
@littlejackrussell12 No, she mimicks a 40 year old woman. In 5 years at the most her voice will not be anything close to what it is now, due to artificial vibrato and unhealthy singing techniques. So... enjoy now.
There are also several concertos written for the theremin.
And yes, because you can change the wave forms on a Moog Etherwave theremin you can get it to blend with singers or stringed instruments. It will sound very similar to a viola. Do some research, people.
@Didigeneral Actually it's one of the many Ave Maria's (pretty much one by every major composer) written hundreds of years before what you're talking about was written.