Stefi Magnetica is out of Mid Summer Music (Oamaru Force), a Group 1 winner in Australia who won 11 races, among them the Gr.1 Stradbroke in 2012. She is also the dam of Hellfest (Fastnet Rock), a Group winner in Australia who took the Gr.3 Typhoon Tracy Stakes, and Euphoric Summer (Not A Single Doubt), Group-placed in Australia as third in the Gr.3 B J McLachlan Stakes. Mid Summer Music died in 2024.

Second dam Samsara Lady (Nassipour).

Third dam Skaya (Proud Appeal) was unraced and is a half-sister to the sire Czaravich (Nijinsky), winner of the Grade 1 Metropolitan Handicap.

Fourth dam Black Satin (Linacre) won the Gr.1 Irish 1000 Guineas. She is closely related to the Group 1-winning sire Long Row (Linacre) and a half-sister to Front Row (Epaulette), who also won the Irish 1000 Guineas, and to Panamint (Run The Gantlet), winner of the Gr.2 Adelaide Cup.

Mid Summer Music delivered a full brother to Stefi Magnetica in the spring of 2024, her last foal.