MIDI Composer

I just got RPG creator 2000 and I need to put in my own music so I need something to create/covert/compose MIDI files

To steal from

And select utilites on the left menu under other, and download Presto and enjoy.

If you want to compose your own stuff, go search for JAZZ MIDI Sequencer - might seem daunting at first, but you can do a heck of a lot of tweaking to it, including placing/timing individual notes per instrument very precisely.