[4] On 13 October at Newmarket Racecourse Musa started favourite for the Prendergast Stakes but was beaten 1+1⁄2 lengths into second place by the American-bred filly Myakka.

[5] Musa began her second season in the 1000 Guineas over the Rowley Mile at Newmarket on 28 April 1899 in which she started at odds of 100/7 and finished third of the thirteen runners behind Sibola and Fascination.

[6][7] In the 121st running of the Oaks Stakes over 1+1⁄2 miles at Epsom Racecourse on 2 June, Musa, ridden by Otto Madden, started a 20/1 outsider in a twelve-runner field.

The ride of the American jockey Tod Sloan on the runner-up was widely criticised and Musa was considered a somewhat lucky winner.

[8] On 29 June at Newmarket Musa was matched against male opposition and older horses in the Princess of Wales's Stakes and finished unplaced behind Flying Fox.