This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Agreeable, very close ...

A Cuckoo egg is an MP3 file that appears to be an illegal copy of a copyright-protected song. After the first 30 seconds or so of the real song, however, the file is overwritten with something else, ...