new LP, “Plastic Hearts,” arrives Friday, it’s clear that her heroes extend far beyond home. Here, a look at some of the stars that shape Miley’s musical universe.In a cross-generational collaboration of our dreams, Nicks joined Cyrus for the “Edge of Midnight (Midnight Sky Remix).” Mashing up Cyrus’ “Midnight Sky” — the first single from “Plastic Hearts” — and Nicks’ 1981 classic “Edge of Seventeen,” the remix is a delight of white-winged doves.