Quicktime.
It doesn't play midi files
...midi files.
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.
To convert MIDI files to ABC format for use in Starbound, you can use a software program or online converter specifically designed for this purpose. These tools will allow you to easily convert the MIDI files into the ABC format that is compatible with Starbound.
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.
You can't do that :D
export to midi first
To learn how to read MIDI files, you can start by studying the MIDI file format and understanding how it represents musical data. You can also use software programs or online resources that allow you to open and analyze MIDI files to practice reading them. Additionally, learning basic music theory and understanding how different musical elements are represented in MIDI can help you interpret the information in the files more effectively.
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.
Next to none.
You can convert MIDI files to scores using music notation software like Finale or Sibelius. These programs can import MIDI files and display them as sheet music that you can edit and print.
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.