I can't really remember where I got it, but I got hundreds of them which I use for ringtones.. You can find some on my homepage, direct link: http://home.c2i.net/cmv/ringtones.html

I just checked out the compression ratio of my other trance-style midi's, and it seems they are all compressing extremely.. Check out the planet perfecto on my page, it's 116kb, and compresses to +-3kb.. I even got one down to 672bytes from 19kb.. Something for a 4k maybe?
Oh, I also checked a random midi from my midi folder, compressed from 28kb to 1011 bytes... :? If you want, I can zip them all down and send them to you.