Far to the north of England about 100 years ago lived an old Orkney pony named Mr. Mendelson. He belonged to a Lord who had given him a piano because Mr Mendelson liked to think about tunes. Everyone knows ponies can't play piano, but the pony's close friends, the field mice, play beautiful. Life would have been perfect except for a swindling gypsy.
Used availability for Joan Aiken's Mice and Mendelson
October 1978 : UK Hardback
July 1981 : UK Paperback
December 2015 : USA, Canada Kindle edition