AFAIK mid file is actually just an instruction for a midi sequencer how to play the instruments. So without sequencer there's nothing to play and players can do very little about it.

There's timidity for fremantle, which is supposedly a very good one (or so i've heard - i don't know much about this stuff), but I'm not aware of it being ported to harmattan. http://maemo.org/packages/package_in...13.2-39maemo1/

It seems to have quite many dependecies too so that package will probably not work on Harmattan as is. (might end up with some conflicting dependencies even if you hunt them down)