These artist are having vocal problems because they are singing with their throats and not their diaphrams. They are staining the thoat and vocal cords to project their voices. Proper vocal techniques indicate voice projection comes from deep within your diaphram. That's why (if you saw a C2C concert) Tony Bennett can sing without a microphone and be heard by everyone in the theater.
Poor fans and her 
it seems bad technique has taken its toll 
