Systems and methods of classifying content items

1. A method of classifying content items, performed at a server system having one or more processors and memory storing one or more programs for execution by the one or more processors, the method comprising, for a content item included in playlists from a plurality of distinct users:

receiving, from respective users of the plurality of distinct users, respective playlist titles for the playlists;

in accordance with a determination that the respective playlist titles from a threshold number of the plurality of distinct users specify a first attribute, assigning the first attribute to the content item;

receiving a request, from a first user via an application that is executing on a client device that is distinct from the server system, for content having the first attribute;

in response to receiving the request, selecting the content item according to the first attribute; and

delivering the selected content item for playback to the first user.

2. The method of claim 1 , wherein the request is a first request, the method further comprising:

receiving a second request from the first user for a sequence of content items having the first attribute;

in response to receiving the second request, selecting a plurality of content items according to the first attribute, wherein each of the plurality of content items was assigned the first attribute based on inclusion in a respective plurality of playlists, wherein each playlist in the respective plurality of playlists has a playlist title that specifies the first attribute; and

delivering at least a plurality of the selected content items for playback to the first user.

3. The method of claim 2 , wherein delivering at least the plurality of the selected content items associated with the first attribute is performed in conjunction with streaming of an Internet radio station to the first user via the application.

4. The method of claim 1 , wherein the first attribute specifies a music genre.

5. The method of claim 1 , wherein the first attribute specifies a holiday or event.

6. The method of claim 1 , wherein at least a plurality of the playlist titles specifies the first attribute by including the first attribute in the text of the playlist titles.

7. The method of claim 1 , wherein assigning the first attribute to the content item comprises classifying the content item based on the first attribute.

8. A server system, comprising:

one or more processors; and

memory storing one or more programs configured for execution by the one or more processors, the one or more programs comprising instructions for:

for a content item included in playlists from a plurality of distinct users:

receiving, from respective users of the plurality of distinct users, respective playlist titles for the playlists;

in accordance with a determination that the respective playlist titles from a threshold number of the plurality of distinct users specify a first attribute, assigning the first attribute to the content item;

receiving a request, from a first user via an application that is executing on a client device that is distinct from the server system, for content having the first attribute;

in response to receiving the request, selecting the content item according to the first attribute; and

delivering the selected content item for playback to the first user.

9. The server system of claim 8 , wherein the request is a first request and the one or more programs further comprise instructions for:

receiving a second request from the first user for a sequence of content items having the first attribute;

in response to receiving the second request, selecting a plurality of content items according to the first attribute, wherein each of the plurality of content items was assigned the first attribute based on inclusion in a respective plurality of playlists, wherein each playlist in the respective plurality of playlists has a playlist title that specifies the first attribute; and

delivering at least a plurality of the selected content items for playback to the first user.

10. The server system of claim 9 , wherein delivering at least the plurality of the selected content items associated with the first attribute is in conjunction with streaming of an Internet radio station to the first user via the application.

11. The server system of claim 8 , wherein the first attribute specifies a music genre.

12. The server system of claim 8 , wherein the first attribute specifies a holiday or event.

13. The server system of claim 8 , wherein at least a plurality of the playlist titles specifies the first attribute by including the first attribute in the text of the playlist titles.

14. The server system of claim 8 , wherein assigning the first attribute to the content item comprises classifying the content item based on the first attribute.

15. A non-transitory computer-readable storage medium storing one or more programs configured for execution by one or more processors of a server system, the one or more programs comprising instructions for:

for a content item included in playlists from a plurality of distinct users:

receiving, from respective users of the plurality of distinct users, respective playlist titles for the playlists;

in accordance with a determination that the respective playlist titles from a threshold number of the plurality of distinct users specify a first attribute, assigning the first attribute to the content item;

receiving a request, from a first user via an application that is executing on a client device that is distinct from the server system, for content having the first attribute;

in response to receiving the request, selecting the content item according to the first attribute; and

delivering the selected content item for playback to the first user.

16. The non-transitory computer-readable storage medium of claim 15 , wherein the request is a first request and the one or more programs further comprise instructions for:

receiving a second request from the first user for a sequence of content items having the first attribute;

in response to receiving the second request, selecting a plurality of content items according to the first attribute, wherein each of the plurality of content items was assigned the first attribute based on inclusion in a respective plurality of playlists, wherein each playlist in the respective plurality of playlists has a playlist title that specifies the first attribute; and

delivering at least a plurality of the selected content items for playback to the first user.

17. The non-transitory computer-readable storage medium of claim 16 , wherein delivering at least the plurality of the selected content items associated with the first attribute is in conjunction with streaming of an Internet radio station to the first user via the application.

18. The non-transitory computer-readable storage medium of claim 15 , wherein the first attribute specifies a music genre.

19. The non-transitory computer-readable storage medium of claim 15 , wherein the first attribute specifies a holiday or event.

20. The non-transitory computer-readable storage medium of claim 15 , wherein at least a plurality of the playlist titles specifies the first attribute by including the first attribute in the text of the playlist titles.