User blog comment:Kirbyna321/Things I Don't Like About Vocaloid/@comment-5665682-20140623171343/@comment-53539-20140624144945

Even "unique" is somewhat stretching. Everything is based on something that came before it. The Vocaloids are based on real singers, therefore have similarities in their vocals to existing things. :-/

As I said with Vocal comparisons, vocal clones (impersonators) exist in real life. It is also possible for a Vocaloid to sound like another Vocaloid based on this idea and concept also.