This was during the second half of the concert. During the interval they ask for requests - and have no idea what they are going to play. Ian made a playlist of around 30 songs from bits of paper the audience had scribbled on and made a note of what key to play thme in..the rest just comes naturally. They have been playing together since they were 18 - but this was the first time for a year....no rehersal. I don't know many people who could do what they do without rehersing!