it is a standard song file

It should fit definitely!

Most modern MIDI devices come with a USB link that passes the MIDI signal to the USB socket of the computer. If a USB connection is not available then a MIDI to USB adapter (See links below) can be added to connect the standard MIDI sockets to the USB socket. These are widely available from various manufacturers at varying prices. The Mac usually recognises when a MIDI device is connected but they can be configured with the Audio & MIDI setup utility found in the Utilities folder within the Applications folder.

MIDI is a standard interface so all MIDI devices communicate with one another in exactly the same way; there is no "best". You can connect the EZ-200 to any other MIDI-enabled keyboard and use one to trigger the other. Alternatively, if you have a MIDI sequencer on your computer you can connect the keyboard to it via a suitable MIDI-to-USB adaptor. This makes it much easier to store and retrieve performance and settings data. For more information on using MIDI, consult page 54 of the EZ-200 user-manual.

MIDI is a standard protocol for connection music devices. Originally, it was used to control other devices, like turning them on or off, setting volume levels, and so forth.

At some point, people invented music generators like synths that could be 'played' by MIDI code.

MIDI was set up so that any device could connect with any other MIDI device.

So, any keyboard with a MIDI output connector should work with any adaptor.