Music accompaniment apparatus

A music accompaniment apparatus such as a karaoke machine operates in two stages, the first stage being a trial stage in which a video signal is reproduced on a display unit 110 but no sound is generated from a speaker In the trial part, a first pitch detector 103 detects the pitch of the accompaniment read from a recording medium. Such as a laser disc at 101. Meanwhile, a second pitch detector 105 detects the pitch of a singer's voice inputted from a microphone 104. If the pitches detected by the first and second pitch detectors 103, 105 are different, an interval adjusting device 107 changes the key of the accompaniment so as to be in perfect pitch with the singer. Thereafter the medium is rewound and, in the second stage, both video and sound are reproduced from the recording medium, the sound being added at 108 to that from the microphone. The apparatus may alternatively be used to accompany a musical instrument.