...started singing about wiping Israel off the map or praised Hitler as a hero for starting the ovens

I have booked Magpie a couple of time when I ran a club here in the UK and know their music well. I think Greg and Terry would be shocked to have their music compared with these statements.

A great deal of folk music is, was and probably always will be about anti-establishment views. I've had some customers grumble about Paul Metsers environmental stance but they could not complain that the music was not of a high standard, as is Magpies.

No, these individuals should not be given their money back for the reasons given by Rabbi-Sol. You do not get your money back if you go to a film and do not like it.

If the performance was way below par.. maybe. For content of the music, no. Otherwise we risk to lose freedom of expression.

Zen