music box

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A music-making device consisting of a housing or box enclosing a sounding mechanism, especially one in which a row of tuned steel teeth are plucked by pins set in a revolving cylinder to produce a melody.

from The Century Dictionary.

• noun Same as musical box (which see, under musical).
• noun A barrel-organ.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A box that generates or plays music, particularly one using mechanical means rather than electronic, generally using a cylinder or disk containing the music.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun produces music by means of pins on a revolving cylinder that strike the tuned teeth of a comb-like metal plate