In various embodiments, a media player or portable media device can enable a user to navigate and discover content or other media assets. The media player may analyze broadcasts and other content streams to determine currently playing and forthcoming content. The media player may switch from one source of content to another to find content that matches user preferences or criteria. The media player may generate playlists based on the matching content, and switch between sources of the matching content automatically. In some embodiments, the media player may receive user input to browse content using a navigation stream. Content associated with stations within the navigation stream may be output. As if the user were tuning a radio dial, the media player may determine what content to played back for each station. The media player may procure content and generate playlists to represent each station focus on by the user.