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...midi files.
It doesn't play midi files
Many MIDI files on the internet are free and legal to download. Theoretically, a MIDI version of a popular song could be called a "derivative work" and be considered a form of copyright infringement, but I doubt that anyone cares that much about MIDI files anymore.
1983
it is a standard song file
Quicktime.
The DGX-220 can play MIDI files, and there is a USB MIDI driver for these models, but there are no applications for XML files for these keyboards.
FL Studio can import MIDI files and export WAV, MP3, OGG and MIDI files.
look around on youtube for Wedding dress on piano MIDI
on the computer
If you mean midi player, it is able to play midi files. Mostly such programs are free of charge and support only this specific function.
Midi to USB cables run from some sort of musical device (electronic keyboard, electric guitar, etc) to a USB port on your computer. You can use it to transfer midi files (music files) into your computer.