When I had my first singing lesson with Isabel I couldn't get out more than three songs before getting a sore throat. It's funny how when I tried it again yesterday, after 10 lessons, I didn't even break a sweat singing the same song, and the high notes aren't really that high anymore!  I can see Isabel is very passionate about what she is doing; the music, the singing, the teaching and it works great for me. Igor Donker