As for singers, I'm fond of Mohit Chauhan.
People are getting more used to another language; that's how I learned English and Spanish. I listened to other singers and tried to sing with them. Of course, I studied it, and I took classes, but music helps me a lot.
When I started, my teachers told me that I had to sing 'Mozart, Mozart, Mozart.' I said, 'No, I want to sing all the other stuff.' If you do not push yourself, you will stay the same. Maybe some singers are happy with that, but I have to move, I have to do something new always.
There are two types of conductors. One is the good conductor who can do passionate music but also listen to the singers and do the orchestra. And then there are great conductors, who have their own opinion on the music, who are ruling everything - and not listening much to the singers, but the orchestra play amazingly.
Donna Summer was one of the strongest female singers in pop music. She was very underrated as a vocalist and a writer, and her songbook is just outrageous.
I had this voice when I was in high school, except nobody thought much of it then. I developed it by imitating singers I admired - Alison Moyet, Boy George, later on Nina Simone.
I have often heard the statement made by foreign singers, as a demonstrated fact, that the German artists are artists in feeling indeed, and serious in their devotion, but that their singing is crude.