The circuit shown in this video was built with a 16F84A PIC Microcontroller. When the button is pressed, it plays a piece of the song "We Wish You a Merry Christmas".
Simulation and code in http://gargadon.teufansub.net/2011/12/el-espiritu-navideno-en-un-pic-16f877a/ (in Spanish). There is a 16F877A PIC version available.
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