Cooper's favourite an emphatic winner of Listowel bumper Second against geldings in a Punchestown festival bumper that is working out well, Celestial Tune was an emphatic winner of the Shanahan Power Irish EBF Mares (Pro/Am) Flat Race at Listowel.   Harry Swan sat third on the 9/4 favourite and moved her up into second on the approach to the straight. The daughter of Maxios headed longtime leader Prophetess Miriam soon after turning for home and went away to account for that rival by nine and a half lengths.  Tralee-based trainer Tom Cooper said: "She is a very nice filly who came back in from grass in the middle of July, so has two months of work done. I hadn't her really drilled so she will improve from this. "We went away to do work with her two weeks ago and she worked well with a horse (Saint Clovis) who finished second here yesterday, who I think is a very good horse.  "She has a great attitude, will go on soft ground and we'll train her for the Listed bumper in Navan next. She has plenty of size so she will make a fine staying chaser down the line." Additional reporting by Tom Weekes