Strangely enough, my back pain is decreasing. Since it is caused by strained or weak back muscles, I believe adapting to longer distances is at the same time helping my muscles increase their strength.
Anyhow, next friday I will be at a concert. I am curious to see how well my back handles standing up for 4 or 5 hrs straight. One year ago I attended a modest mouse concert (before I started cycling) and my back felt like it was falling apart.
Plus, my massage therapist is always there for a bit of maintenance. Sometimes more the maintenance when I increase distances.