help with 'super mario world' style music change

Hmm, if there actually is some way to jump into a midi, you could measure the BPM of the "original" music, and set a timer when it original midi starts to play. Whenever the timer hits certain key points, (e.g. the time corresponding to eight beats) you can check for conditions to change the music. I haven't used RPGMaker for almost two years though, so I don't know what is possible to do these days. If RPGMaker has a modulo operator, it would help a lot. If you can't jump into a midi file, start off with something really repetitive and switch to a more complex piece?

The problem is, there's nothing in RM2k3 that I know of that will let you play a midi from anywhere but the beginning. (Or any sort of media file, for that matter)