SoundHound has teamed up with Spotify to make it easy for you to create a playlist of songs you've identified. Now with "Hey SoundHound", adding to that playlist has never been easier. After identifying a song, simply say, "OK Hound, add this to my Spotify playlist."
You can actually add songs whenever you feel the urge; you don't have to wait until you identify one. For example, you can say something like "Hey SoundHound, add "Nobody Love" by Tori Kelly to my Spotify playlist."