It would need more work and testing on Windows and things would depend on creation order but I'd probably be looking at a Python3 script along these lines.

  import os
  import sys
  from pathlib import Path
  
  i = 1
  
  def dopaths(currpath):
      
      global i
      global outpath
      
      try:
          paths = sorted(Path(currpath).iterdir(), key=os.path.getctime)
      except:
          print("path not found: " + currpath)
          return
      
      dirname = os.path.basename(currpath)
      
      for afile in paths:
          if (os.path.isdir(afile)):
                  dopaths(str(afile))
          elif (".mp3" == os.path.splitext(afile)[1]):
              newname = str(i).zfill(2) + "-" + dirname + "-" + os.path.basename(afile)
              os.rename(afile, os.path.join(outpath, newname))
              i = i + 1
      try:
          os.rmdir(currpath)
      except:
          pass
  
  try:
      dirpath = sys.argv[1]
      outpath = sys.argv[2]
  except:
      print("Usage: test2.py sourcepath destpath")
      sys.exit()
      
  try:
      os.mkdir(outpath)
  except FileExistsError:
      pass
  except:
      print("can not create destpath")
      sys.exit()
      
  dopaths(dirpath)
  
  --
  jon@worthy:~/test> dir testfiles -R
  testfiles:
  drwxr-xr-x 4 jon users 32 Jul  3 03:09 incds
  
  testfiles/incds:
  drwxr-xr-x 2 jon users 53 Jul  3 03:08 disk1
  drwxr-xr-x 2 jon users 53 Jul  3 03:10 disk2
  
  testfiles/incds/disk1:
  -rw-r--r-- 1 jon users 2 Jul  3 03:07 one.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:08 three.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:08 two.mp3
  
  testfiles/incds/disk2:
  -rw-r--r-- 1 jon users 2 Jul  3 03:10 five.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:09 four.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:10 six.mp3
  
  jon@worthy:~/test> python3 test2.py /home/jon/test/testfiles/incds /home/jon/test/testfiles/outcd
  
  jon@worthy:~/test> dir testfiles -R
  testfiles:
  drwxr-xr-x 2 jon users 154 Jul  3 03:13 outcd
  
  testfiles/outcd:
  -rw-r--r-- 1 jon users 2 Jul  3 03:07 01-disk1-one.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:08 02-disk1-two.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:08 03-disk1-three.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:09 04-disk2-four.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:10 05-disk2-five.mp3
  -rw-r--r-- 1 jon users 2 Jul  3 03:10 06-disk2-six.mp3

But I don't think most Windows users have Python installed.