I don't agree, but then again my musical ear could probably use a tune up. Music has never been really important to me.
I think Carrie sounds good. The country sound is nice.
I play trumpet and, more importantly, French Horn.
Brass Players have to develop their ears so they can keep their tone in tune. This is really difficult with a French Horn, since the valves have minimum influence on the sound.
Your lips do all the work and your ears are the feedback.