In the MCU, music is important to two chief figures: Peter Quill, lead character of Guardians of the Galaxy, and James Gunn, that film's writer/director. As such, Gunn saturated this film and its sequel with wall-to-wall rock, pop, and soul music, embedding the idea of mixtapes into the films' narratives (and selling/streaming them as soundtracks for a pretty penny, too). Now, for all you fellow MCU/music fans, Gunn has put together a new GotG playlist and posted it on Spotify. And this time, it's devoted to Peter Quill's mother, Meredith Quill. If …