PMB makes some good points, but I don't really agree with the observation about the highland bagpipes. I would agree that they're not suited to pub performance, but there are other types of Scottish pipes which are more suitable - the smallpipes, for example. The highland pipes constitute their own ecosystem, I think, which is separate from the session scene - that's to say, they're not really a 'folk' instrument like the fiddle or smallpipes. They're more of a courtly and martial instrument.