Information processing device and non-transitory computer-readable medium

1. An information processing device, comprising:

a receiver configured to receive a specification of a desired brain wave state of a user; and

a controller configured to control playback of music configured to transition a brain wave state of the user to the desired brain wave state or to maintain the desired brain wave state,

wherein the controller is configured to control playback of the music while changing a playback order of respective pieces of music in a playlist to transition the user's brain wave state to the desired brain wave state or to maintain the desired brain wave state,

wherein the controller is configured to execute a brain wave state evaluation unit which computes, for each of the respective pieces of music in the playlist, a difference between a numerical value expressing a brain wave state of the user during a previous playback of the respective piece of music and a numerical value expressing the desired brain wave state, and

wherein the controller is configured to change the playback order of the respective pieces of music in the playlist in response to the computed differences.

2. The information processing device according to claim 1 , wherein the playlist is a list shareable with other users.

3. The information processing device according to claim 1 , wherein the controller is configured to play back the music, wherein the music is provided by a music delivery service for sample listening, and wherein the controller is configured to, during the playback, control a display configured to display the user's brain wave state.

4. The information processing device according to claim 3 , wherein the controller is configured to determine whether or not to add the music being played back to the user's playlist on a basis of the user's brain wave state during the playback, and wherein the controller is configured to control a display configured to display a result of the determination.

5. The information processing device according to claim 3 , wherein music is predetermined for individual brain wave states,

wherein the controller is configured to play back music corresponding to the desired brain wave state for sample listening, and

wherein the controller is configured to, in response to the user's brain wave state during the playback corresponding to the desired brain wave state, wherein the controller is configured to control a display configured to display an indication of the correspondence.

6. The information processing device according to claim 3 , wherein the music delivery service is a service that delivers music for a fee, and

wherein the information processing apparatus is configured to change a price of each piece of music in accordance with an effect of music playback on the brain wave state.

7. The information processing device according to claim 3 , wherein the music delivery service is a service that delivers music for a fee, and

wherein the controller is configured to control a playback time of music for sample listening to be shorter than a playback time of paid music.

8. The information processing device according to claim 3 , wherein the music delivery service is a service that delivers music for a fee, and

wherein the controller is configured to control a sound quality of music for sample listening to be lower than a sound quality of paid music.

9. The information processing device according to claim 3 , wherein the information processing device is configured to make sample listening of music available in response to the user wearing a brain wave measuring device configured to measure brain waves.

10. The information processing device according to claim 1 , wherein the controller is configured to play back the music while changing a volume of the music in accordance with the user's brain wave state.

11. The information processing device according to claim 1 , wherein the controller is configured to play back the music while arranging the music in accordance with the user's brain wave state.

12. The information processing device according to claim 1 , wherein the controller is configured to control a display configured to display a result of a comparison between an effect of music playback on the user's brain wave state, and an effect during playback in the past.

13. The information processing device according to claim 1 , wherein the controller is configured to control a display configured to display a result of a comparison between an effect of music playback on the user's brain wave state and an effect of music playback on a brain wave state of another user.

14. The information processing device according to claim 1 , wherein the controller is configured to control playback of the music, wherein the music is configured to transition the user's brain wave state to the desired brain wave state or to maintain the desired brain wave state.

15. The information processing device according to claim 1 , wherein the controller is configured to control playback of the music conforming to a current location of the user.

16. The information processing device according to claim 1 , wherein the controller is configured to change the playback order of the respective pieces of music in the playlist in response to the computed differences by arranging the playback order in order of smallest respective computed difference.

17. A non-transitory computer-readable medium storing a program that, in response to the program being executed by a computer, causes the computer to execute a process for processing information, the process comprising:

receiving, by a receiver, a specification of a desired brain wave state of a user; and

controlling, by a controller, playback of music configured to transition a brain wave state of the user to the desired brain wave state or to maintain the desired brain wave state,

wherein the controlling comprises controlling playback of the music while changing a playback order of respective pieces of music in a playlist to transition the user's brain wave state to the desired brain wave state or to maintain the desired brain wave state,

wherein the controlling comprises executing a brain wave state evaluation unit which computes, for each of the respective pieces of music in the playlist, a difference between a numerical value expressing a brain wave state of the user during a previous playback of the respective piece of music and a numerical value expressing the desired brain wave state, and

wherein the controlling comprises changing the playback order of the respective pieces of music in the playlist in response to the computed differences.

18. An information processing device comprising:

a receiver configured to receive a specification of a desired brain wave state of a user; and

a controller configured to control playback of music configured to transition a brain wave state of the user to the desired brain wave state or to maintain the desired brain wave state,

wherein the controller is configured to control playback of the music while changing a playback order of respective pieces of music in a playlist to transition the user's brain wave state to the desired brain wave state or to maintain the desired brain wave state,

wherein the controller is configured to execute a brain wave state evaluation unit which computes, for each of the respective pieces of music in the playlist, a transition time taken to transition to the desired brain wave state, and

wherein the controller is configured to change the playback order of the respective pieces of music in the playlist in response to the respective computed transition times.

19. The information processing device according to claim 18 , wherein the controller is configured to change the playback order of the respective pieces of music in the playlist in response to the respective computed transition times by arranging the playback order in order of shortest respective computed transition time.

20. An information processing device comprising:

a receiver configured to receive a specification of a desired brain wave state of a user; and

a controller configured to control playback of music configured to transition a brain wave state of the user to the desired brain wave state or to maintain the desired brain wave state,

wherein the controller is configured to control playback of music while changing a playback order of respective pieces of music in a playlist to transition the user's brain wave state to the desired brain wave state or to maintain the desired brain wave state,

wherein the controller is configured to execute a brain wave state evaluation unit which computes, for each of the respective pieces of music in the playlist, a length of time the desired brain wave state is sustained, and

wherein the controller is configured to change the playback order of the respective pieces of music in the playlist in response to the respective computed lengths of time the desired brain wave state is sustained.

21. The information processing device according to claim 20 , wherein the controller is configured to change the playback order of the respective pieces of music in the playlist in response to the respective computed lengths of time the desired brain wave state is sustained by arranging the playback order in order of longest respective computed length of time the desired brain wave state is sustained.