World Class Singers use Middle Voice

Wikipedia lists the following singers as ones who use the Middle Voice - there is no greater endorsement!

Celine Dion
Atif Aslam
Ziana Zain
Mariah Carey
Lara Fabian
Regine Velasquez
Niki Astria
Aretha Franklin
Tevin Campbell

Voice lessons?

Question by MeganW: Voice lessons?

Voice lessons- How much did they improve your voice/how much do they usually improve the voice? How long does it take to find a significant improvement in your voice? If you are a voice teacher: What has been one of your best cases (One of the worst singers you’ve [...]