7. The computer-implemented method of claim 5 , wherein the rotational navigation control element includes a circular progress indicator reflective of progress through a predetermined portion of the audio content item, and wherein the circular progress indicator is selectable to indicate a location within the audio content item and cause output of a portion of the audio content item corresponding to the indicated location in response to selection.
5. A computer-implemented method comprising: as implemented by one or more computing devices configured with specific computer-executable instructions, outputting a portion of an audio content item synchronously with a portion of a textual content item; generating, within the portion of the textual content item, an output indicator indicating a location within the portion of the textual content item that corresponds to a current output position within the portion of the audio content item; receiving first data from an input device; determining the first data corresponds to a predefined gesture to cause display of a rotational navigation control element on a display device; displaying the rotational navigation control element using the display device; receiving second data from the input device, the second data representing a rotational input associated with the rotational navigation control, the rotational input representing a request to navigate the textual content item, using the output indicator, to locate a specific word within the textual content item and further representing a request to navigate, in the audio content item, to a location corresponding to the specific word within the textual content item; displaying the output indicator at the third location specific word within the second textual content item; outputting a second portion of the audio content item from a location in the audio content item that corresponds to the specific word within textual content item located using the rotational input.