Converting mp3/wav to midi.

[[wcip]Angel]

Not being able to find a midi-version of Ennio Morricone's "Extacy of gold" from the film "The good, the bad and the ugly", I decided to put some effort into finding out whether it was possible to convert an mp3 or a wav-file to midi-format.

Is it feasible?

edit: If you're wondering why on earth I would want Extacy of gold in midi, it's because I want it as a ringtone for my Nokia 3510i cellular phone.