idk if you guys dig sufjan stevens around here but he's made a habit of openly recycling melodies and progressions over the course of his career — most notably his signature song "chicago" is entirely derived from the outro of the previous album's closer. reworking old ideas into something better is a natural part of the creative process and i really do appreciate it when artists do it shamelessly and in public. tho of course it doesn't play well when it seems like they're reusing old ideas for lack of any inspired new ones