I have heard group singing on a bus twice in the last few years. One was a bunch of young Christian women on a trip from Glasgow to Iona whose repertoire seemed to come entirely from "Singing Together" - rather sweet. The other was on a late night service from Edinburgh to the Borders where a slightly sloshed young woman led the whole bus in a singalong of Dougie Maclean's "Caledonia", prompted by a video played on her iPad.

Both made the trip more fun.