My voice changes from morning to evening. If I practice songs in the morning for an evening concert, I often find I'm stronger on the lowest notes in the morning, and have trouble at the top fo my range.

Just for a quantum shift here, I had surgery on my leg yesterday, and it's worth commenting. Six years ago I went to have a small mole removed on the corner of my mouth. I kept nicking it when I shaved and it would start bleeding without advanced, written notice. I was having a lot of trouble with it and was scheduled to do a concert, so I didn't want it to start bleeding while I was performing. It was a quick, office snip-off. After the snipping, my Doctor showed me a pamphlett about moles and what to look for. If a mole changes appeareance, enlarges, or gets a poorly definied margin, you should have it checked. I remembered that these last six years, and a couple of months ago a mole on the back of my leg started itching like crazy. When I'd scratch it, it would bleed. I left it alone and thought it would heal but the itching never went away. I couldn't really see clearly if it had cchanged in appearance, because it's on the bnck of my leg and hard to see. I went to my Doctor, and he sent me to a specialist, who removed the mole and sent it for a biopsy. It came back positive. I had melanoma, a variety of skin cancer. If you catch melanoma early, there is close to a 100% rate of cure. If it gets too far along, it can mestasize and spread cancer throughout your body and be fatal.
Yesterday, they cut out the skin around the area where my mole was removed, taking out about an inch and a half of skin. They will do a biopsy on it, and if they got all the melanoma cells out, the chance of any future problems will be verging on nill, although they'll monitor me for two years. If there are still cancer cells along the margin, they'll cut another quarter of an inch of skin off and sew it up again. They would keep doing this until they are positive they've removed all cancer cells.
I mention this because it's something everyone should know. This is an extreme case of the importance of early detection that can make the difference between a minor operation or death at the other extreme. Tuck it in the back of your mind and remember it, will you? I wish I had known more about this so that I could have caught mine earlier, although all three doctors think I have an excellent chance of having removed all traces with the operation I had yesterday. I won't be sure until they do the biopsy, but I am very hopeful. If there are still cells to be removed, they'll be removed.
I'm feeling very thankful today.