It was due to old strings. I figured I could get one more practice out of them and I darn near did. I should mention that I have NEVER broken a string at a gig (shoot, I said that out loud).If strings are breaking on stage, or anywhere else, one of three things is happening-
1. Bad right hand technique/playing too hard.
2. Something is wrong with the guitar and it needs fixed.
3. The strings are too old and fatigued to be on stage with.
Number one can contribute greatly to number three.
I change my strings every gig. Every single one. Sometimes that means five times a week. So be it. It’s a business expense.
I’m also insanely anal about maintaining my instruments and keeping them in top fighting shape. They may get beat up and look worn, but functionally they are 110% at all times.
Between fresh strings and constant maintenance, I have not broken a string in almost twenty years. Even though number one is definitely an issue for me when I get caught up in the moment. I stopped carrying a backup guitar probably ten years ago, because I never used it. Not once. I always carry a tool kit, including soldering stuff, but I even go on tour with just one instrument.