Is there any good FREE mp3 to midi software for windows xp?
Turtle Bay 777
You can use this which is excellent and free, https://www.ofoct.com/audio-converter/convert-wav-or-mp3-ogg-aac-wma-to-midi.html
Here's a list of the 10 'best' .mp3 to midi converters, my friend, but you MUST be sure to read as they are NOT all free.
MIDI to MP3 is not that difficult, but MP3 to MIDI is much harder. It not really something that is easily done, let alone for free!