Moss Tucker is the only winner from the first four foals out of Rare Symphony (Pastoral Pursuits), who won twice on the Flat and twice over hurdles. She is a half-sister to Pantsonfire (Sir Percy), winner of the Grade 3 Astra S., to Pantsonfire's full brother Bomar, winner of the Listed Swedish Derby, and to Liar Liar (Dream Ahead), Listed-placed in the US.

The second dam Rubileo (Galileo) was unplaced and produced six other winners, among them Pantsonfire, Bomar and Liar Liar.

The third dam Ruby Affair (Night Shift) was placed and produced eight winners, headed by Hammadi (Red Ransom), a Listed winner in the UAE, and the Listed-placed Francis Cadell (Cadeaux Genereux).

Ruby Affair is a half-sister to Island Sands (Turtle Island), winner of the Gr.1 2000 Guineas and a sire.

Rare Symphony has an unraced 2-year-old gelding by Poet's Word and a yearling filly by Sumbal.