transcribing MP3 to score with Midi

No. Converting the data in an audio file into data about the individual notes and instruments is beyond the reach of any current technology.

First I would like that people offered solutions (even if they are ONLY PARTIAL solutions) rather than just saying current technology has nothing to offer)

There is at least one programme called Melodyne that will create a Midi file from a 16-bit .wav file. it will recognise harmonies as long as the notes are loud enough, you can get reasonable results if you are in a position to

download a version of Melodyne, (see download link to portable version) and Audacity ( link also below)

http://www.mediafire.com/download/9qedoomo92pjo1i/Melodyne_Editor.exe

* spend hours in one song. you will need to work on very small segments of your song, use the parametric EQ in Audacity to remove all of the lower frequencies, then maybe do the opposite and eliminate the high frequencies to get the bass, use the library
Elevayta_Extra_Boy_Pro_Demo (Vocal remover
plugin for Audacity for removing a main singer's vocals). For this you need to unzip the file and copy the .dll file to the VST plugins folder. Then you open Audacity, check the option reload plugins, close Audacity and open it again, click on the Effects menu and select Elevayta option.

WARNING - it will make mistakes and include notes that are not in the harmonies, BUT it will also include the ones that are there. so a CONSIDERABLE amount of listening and correcting will be needed.

An example:

http://musescore.com/user/201414/scores/190225#

Secret (2007 film)