If you need to turn some music file (for example .flac files) to MIDI instrumental music (.mid, .midi), you will need to use some special audio editors with MIDI export function. One of such software is for example the WavePad which offers great file support and can be download for free for non commercial use.
Convert Audio files encoded by Flac - free lossless audio codec to MIDI audio.
We found one software available in the database for this conversion.
Microsoft Windows software - convert flac to mid on Windows
An audio editing software for Windows and Mac
Convert from flac file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.