After Frankie Dettori had brought the 7-4 favourite home three-quarters of a length ahead of Morning Music, with Henry Cecil's first juvenile runner of the year, Wince, a further four lengths away in third, Loder said: "That was good and the Queen Mary Stakes is now a distinct possibility."
Blue Melody is closely related to some other high-class performers including Blue Duster and carries the colours of Sheikh Mohammed.
Loder added: "I was in two minds about running her today as I wasn't quite sure she was ready, but Frankie was much more confident than me and he was right. She did it well and we are also thinking about the Coventry Stakes at Royal Ascot for Agreeable who won at Newmarket on Saturday."
Loder has now won with two of the three youngsters he has run this term from his team of 80 juveniles.
Wince showed plenty of speed and will no doubt go on with this experience under her belt but the rest of the afternoon belonged to her jockey, Kieran Fallon, who netted a 37-1 treble. Fallon got punters off to a good start by taking the opening two races aboard the favourites High Premium in the claiming stakes and Kheyrah in the fillies' stakes.
Fallon completed the treble when bringing Murchan Tyne through to head the favourite, Phantom Waters, in the last two furlongs of the John Ferneley Handicap and beat that rival by a length and three-quarters.