You need nerve-settling(?) or do you mean that's what you use to help settle my nerves?
My favorite to start with is definitely Yellow Rose of Texas.
Yes, that should work as you tend to arrive about 3 minutes late.
That tune does not settle the nerves. it's sort of....exciting.
Often it will be Camptown Hornpipe or Cotton Pod Walk Around. Sometimes Ober de Mountain.
Playing solo I often begin with Johnny Boker.
Yea, that one is a good one to settle in with.