Jane mentioned "got me to reduce the volume on high notes".

I think that's important.

Some otherwise good singers, including some highly respected (but now deceased) traditional singers, get/got very loud on the top notes while being much quieter on the lower notes. In a live performance in a small room it doesn't much matter unless the loud is painfully so (which it is with some singers whom I will forbear to name). If I'm listening to a recording in my car I have to keep turning the volume up and down to be able to understand the words on the quiet bits without the loud being too loud.