Apple includes an updated way to line up the tracks you want to listen to next. Now when you are looking at any song in Apple Music or in your library you can add them to an on the go playlist that lets you line up the tracks you'll listen to next.
The two options are Play Next and Add to Up Next. The first option will make this the next song you hear, but it will let you finish your current song. Add to Up Next will let you add this to a playlist that fits your mood, without making a special playlist.
This isn't a revolutionary feature, but it is one that Apple's music app has been missing for a long time. The new feature is an excellent way to line up 10 to 15 songs to listen to when you are in a specific mood. There is no clear way to add this up next playlist to a saved playlist, so keep that in mind.