An optical medium, such as Blu-ray Disc (BD) medium, presents audiovisual
information in a user selected Karaoke mode by mixing first and second
audio streams and a textual stream according to synchronization
information. For instance, the first stream has instrumentation and the
second stream has vocals so that the audio output from the streams may
include normal play mixing both streams to have instrumentation and
vocals, instrumentation-only play having only one stream presented, or
instrumentation with guide vocals having the stream associated with
vocals processed at a subdued volume or varied speaker location.
Alternatively, the first stream has instrumentation with vocals and the
second stream has inverse vocals so that mixing the streams provides
subdued or no vocals. The text stream presents lyrics in a text box of a
graphics plane of a display, the lyrics synchronized to the
instrumentation and vocals.