It should be possible, actually.... Just don't expect to get anything high quality or carrying over all the notes from the wma. It also should depend on the type of wma or mp3 song you want to convert over to midi... If you're trying to convert a song with a voice in it with a billion other instruments, give up - you'll never get all that. On the other hand, if it's, say, a piano solo, you probably have a fair chance of converting the file fairly decently. However, keep in mind that midi files are pretty much just sheet music - they don't retain any sound, just note values. Therefore, when you play the midi, the file won't have the tone or qualities the original had. It'll just use a synthetic instrument (By default a grand piano synthesizer) to play the note values it got from the real audio.
