Music can change your mood to match the music's mood. I used to have a file of songs that improved my mood. It had things like Bobby McFerrin's Don't Worry, Be Happy; Petula Clark's Downtown; Simon and Garfunkel's Feeling Groove; Israel Kamakawiwo'ole's Somewhere Over the Rainbow; Liza Minnelli's Cabaret. Stuff like that. Not very original. Just songs that are upbeat or make me smile and feel more cheerful. Sometimes it works; sometimes it doesn't.