In 1890 mad scientist Thomas Edison marketed a set of dolls to girls. These dolls contained wax cylinders, which played songs. Unfortunately, the target audience reacted with sheer terror disinterest, and the line ended.
Collectors have some remaining copies, but have never played the audio tracks, because of the storage medium's extreme fragility. "[F]or years, the dolls sat side by side inside a display cabinet, bearers of a message from the dawn of sound recording that nobody could hear."
Some excellent imaging technology copied the media well enough to allow playback. So we can listen to 19th-century young women reciting poems and prayers. Here's a direct link to one, which is very shrieky.
Ghostly voices indeed.
(thanks to Chris Worden)