serena's song is a smaller than average, but athletically built bay mare. her sire rahy was a grade ii winner on turf and grade i-placed, but was more successful at stud and became notable primarily as a sire of broodmares and racemares. rahy has also sired 2006 u.s. champion two-year-old filly dreaming of anna, breeders' cup turf winner and european horse of the year fantastic light, and the outstanding broodmare mariah's storm, among other notable horses. serena's song's dam imagining, a daughter of northfields, won two of her 26 races but became a successful broodmare who also produced grade iii winner vivid imagination and graded stakes producers river saint and serena's sister.