Abstract: A user listening to a content item on a preceding device and wishes to continue with the listening experience on a subsequent device initiates a continuity request from the subsequent device to the preceding device. The preceding device responds to the received continuity request by determining a multiverse identification that is contained in the continuity request, such that the multiverse identification uniquely identifies the content item that is currently playing on the preceding device over all known playback devices with which it has communicated. The subsequent device determines if the content item exists in a local database of the subsequent device and, if it exists, the subsequent device plays the content item from the local database of the subsequent device, and otherwise obtains the content item.

Abstract: Mobile devices that perform synchronization operations are configured to reduce the amount of data that must be synced to perform a media content sync operation over a wireless connection. The sync operation is implemented as a two-phase arrangement, synchronizing first in a metadata sync operation and then in a media content sync operation. The source device transmits to the destination device a last known version number of the music database that was synced to the destination device and a current version number of the media database at the source device. In response to a failure of the network connection before completion of the metadata sync operation, upon establishment of a second network connection between the source device and destination device, the metadata sync is completed only for any version numbers that indicate a version subsequent to the last version number that was synchronized over the first network connection.

Abstract: Mobile devices that perform synchronization operations are configured to reduce the amount of data that must be synced to perform a media content sync operation over a wireless connection. The sync operation is implemented as a two-phase arrangement, synchronizing first in a metadata sync operation and then in a media content sync operation. The source device transmits to the destination device a last known version number of the music database that was synced to the destination device and a current version number of the media database at the source device. In response to a failure of the network connection before completion of the metadata sync operation, upon establishment of a second network connection between the source device and destination device, the metadata sync is completed only for any version numbers that indicate a version subsequent to the last version number that was synchronized over the first network connection.

Abstract: A user listening to a content item on a preceding device and wishes to continue with the listening experience on a subsequent device initiates a continuity request from the subsequent device to the preceding device. The preceding device responds to the received continuity request by determining a multiverse identification that is contained in the continuity request, such that the multiverse identification uniquely identifies the content item that is currently playing on the preceding device over all known playback devices with which it has communicated. The subsequent device determines if the content item exists in a local database of the subsequent device and, if it exists, the subsequent device plays the content item from the local database of the subsequent device, and otherwise obtains the content item.