And they’re off! On the eve of the Kentucky Derby, “Picture Perfect” will focus on music from movies about horse racing. Join Ross Amico for selections from “The Black Stallion” (Carmine Coppola), “The Reivers” (John Williams), “Seabiscuit” (Randy Newman), and “Hidalgo” (James Newton Howard). Start your weekend with a mint julep, this Friday at 6 pm.