Is no musical sacred? Now playing on the Philadelphia Top 40 station: a song that has lifted the melody for its chorus (“Let’s make love and dance the night away”) wholesale from “Hernando’s Hideaway,” which, a Google search tells me, is actually from “The Pajama Game.” I eagerly await the girl-group shout-out to empowerment set to the “Pippin” dance music that ripped off the music from “Vampyros Lesbos.” No, really.