Productive Morning by Spotify is a great playlist to listen to when you just feel like relaxing and winding down. I usually listen to this at the end of the day when I feel brain dead or when I wake up, so I can have a nice and soothing start to my day.
This is my Rainy Day playlist and this is updated on a regular basis. It contains all of my favorite songs at the moment.
Holiday Jammin' is also another one of my playlists on my other Spotify account. These are my favorite songs to listen to during the Christmastime.
Peaceful Piano by Spotify is a great playlist to listen to when you are stressed or exhausted. This is quite optimal to listen to when you have a huge stack of homework right next to you. :)