Sometimes, live performances incorporate prerecorded sounds.
For example, a disc jockey uses disc records for scratching,
and some 20th century works have a solo for an instrument or voice
that is performed along with music that is prerecorded onto a tape.
Computers and many keyboards can be programmed to produce
and play Musical Instrument Digital Interface (MIDI) music.
Audiences can also become performers by participating in karaoke,
an activity of Japanese origin which centres around
a device that plays voice-eliminated versions of well-known songs.
Most karaoke machines also have video screens that show lyrics
to songs being performed; performers can follow
the lyrics as they sing over the instrumental tracks.