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We already know that storage media are musical instruments, with floppy disks playing the Star Wars theme and hard drives producing a rendition of the Imperial March. Now printers are getting in on the orchestral action. Behold as a dot matrix printer plays "Eye of the Tiger" from Rocky:
Such magic is a combination of custom hardware and software. Says the video's creator on how you too can produce this tune:
Learn about electronics, reverse engineering, embedded software development, maybe some hardware description language, the MIDI protocol and some music theory (how notes relate to frequencies). Then take your printer apart, find out how it works, disconnect the original processor from everything you need and add your custom built electronics…
The MIDI files have to be edited a bit to be played on the printer: some channels need to be disabled (percussion stuff), some are transposed to avoid exceeding the frequency limit. Also the volume of the individual instruments never fits when the original settings are used.
Get started with the MIDI file that was adapted to this purpose; it's available for download.