Musidora came from the second crop of foals sired by Nasrullah, a talented but temperamental racehorse who became a highly successful breeding stallion, especially following his export to the United States in 1950.
[2] In 1947 the yearling filly was sent to the Doncaster sales where she was bought for 4,700 guineas by the Scottish shipping magnate Norman Donaldson.
[7] In the Epsom Oaks a month later, Musidora was made 4/1 favourite against sixteen opponents, with Vice Versa on 5/1 and the French-trained Coronation on 6/1.
In a closely contested finish Musidora took the lead inside the final furlong and won by a neck from Coronation, with a gap of two lengths back to Vice Versa in third and Avila fading into fifth.
She finished unplaced in the Yorkshire Oaks at York, the St Leger Stakes at Doncaster and the Doonside Cup at Ayr.
Her daughter Wishful Thinking, sired by Petition, produced Heavenly Thought, who won the Princess Royal Stakes in 1970.
Heavenly Thought, in her turn, became a successful broodmare, producing the Queen Elizabeth II Stakes winner Homing as well as Water Mill, who finished second in the 1980 St Leger.