In some implementations, a system can be configured to route media data to playback devices based on a context associated with the media data. For example, the media data can include audio and/or video data associated with media items, such as music, movies, television shows, etc. The media data can include audio and/or video data generated by software, such as audio/video output from gaming applications and/or an operating system. The context can be determined based on the source of the media data and the media data can be routed to playback devices based on the determined context. For example, when the context is a media context associated with a media item source, the media data can be routed to remote playback devices for presentation. When the context is a system context associated with a software source, the media data can be presented by a local device.