Midsomer Murders S10E04 - The Axeman Cometh

Barnaby is delighted that his heroes, Hired Gun, are reuniting to play at the Midsomer Rocks festival - minus their drummer, who disappeared 30 years ago after driving his car into a quarry. However, a string of bizarre warnings convinces the paranoid lead singer that someone is trying to stop the reunion, and his fears are confirmed when the backing singer drops dead on stage.