So, I couldn't find a decent UTF-8 NFC normalizer. So I made one.

Program.cs

using System;
using System.IO;
using System.Text;

namespace FileNormalizer
{
    class Program
    {
        static void Main(string[] args)
        {
            var arg = (args.Length > 0) ? args[0] : @"E:\Users\Cayde\Music";
            Normalize(new DirectoryInfo(arg));

            Console.WriteLine("Done!");
            Console.ReadLine();
        }

        private static void Normalize(DirectoryInfo di)
        {
            foreach (var fi in di.GetFiles())
            {
                var name = fi.Name;
                var norm = name.Normalize(NormalizationForm.FormC);
                if (name == norm) continue;

                Console.WriteLine("{0} is not normalized, fixing", norm);
                File.Move(fi.FullName, Path.Combine(fi.DirectoryName, norm));
            }

            foreach (var d2 in di.GetDirectories())
            {
                var name = d2.Name;
                var norm = name.Normalize(NormalizationForm.FormC);
                if (name != norm)
                {
                    Console.WriteLine("{0} is not normalized, fixing", norm);
                    File.Move(d2.FullName, Path.Combine(d2.Parent.FullName, norm));
                }

                Normalize(d2);
            }   
        }
    }
}