If your air conditioner is playing the song "Holiday in Cambodia," it is highly unlikely that the air conditioner itself is intentionally singing or playing music. Air conditioners are designed to cool and circulate air, and they do not typically have built-in music capabilities.
There may be an external factor causing the sound. It's possible that the song is coming from a nearby speaker, radio, or any other audio device that is accidentally playing the song. The sound might be carrying through the air or reverberating in a way that makes it seem like it's coming from the air conditioner. I would recommend checking the surrounding area for any audio sources that could be playing the song.
If you cannot find any external audio sources and you are certain that the sound is originating from the air conditioner itself, it could indicate a malfunction or electrical issue. In this case, it would be wise to contact a professional technician or an electrician to inspect and repair your air conditioner.