The waltz can be sad and at the same time uplifting. You have to see life from both sides and the waltz encapsulates that. If you're in my audience you give yourself to me and the waltz will grab you.
Shutting off the thought process is not rejuvenating the mind is like a car battery - it recharges by running.
For the last third of life there remains only work. It alone is always stimulating rejuvenating exciting and satisfying.