itunes.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using iTunesLib;

namespace ConsoleApp1
{
	class Program
	{
		// Must NOT be run as admin
		static readonly List<Track> library = new List<Track>();

		static void Main(string[] args) {
			
			var type = Type.GetTypeFromCLSID(new Guid("DC0C2640-1415-4644-875C-6F4D769839BA"), true);
			
			var app = Activator.CreateInstance(type) as iTunesApp;

			Console.WriteLine("Loading");
			var sw = Stopwatch.StartNew();

			var enumerator = app.LibraryPlaylist.Tracks.GetEnumerator();
			while (enumerator.MoveNext()) {
				ProcessTrack(enumerator.Current as IITTrack);
			}

			sw.Stop();
			Console.WriteLine($"Loaded in {sw.Elapsed.TotalSeconds} seconds");

			GetAlbumsWithOnlyOneSong();

			// GetAlbumsWithMultipleGenres();

			Console.ReadLine();
		}

		private static void GetAlbumsWithOnlyOneSong() {
			var albums = library.Select(l => l.Album).Distinct();
			foreach (var album in albums) {
				var albumTracks = library.Where(t => t.Album == album);

				if (albumTracks.Count() == 1) {
					Console.WriteLine($"{album} - {albumTracks.Single().Artist} - {albumTracks.Single().Name}");
				}
			}
		}

		private static void GetAlbumsWithMultipleGenres() {
// So for example, get albums with multiple genres
			var albums = library.Select(l => l.Album).Distinct();
			foreach (var album in albums) {
				var albumTracks = library.Where(t => t.Album == album);
				var albumGenres = albumTracks.Select(t => t.Genre).GroupBy(t => t);
				if (albumGenres.Count() > 1) {
					string genres = string.Join(",", albumGenres.Select(g => g.Key + ":" + g.Count()));
					Console.WriteLine($"Album {album} has multiple genres: {genres}");
					Console.WriteLine();
				}
			}
		}

		private static void ProcessTrack(IITTrack track) {
			if (track.Kind == ITTrackKind.ITTrackKindSharedLibrary) {
				return;
			}

			library.Add(new Track {
				Album = track.Album,
				Artist = track.Artist,
				Genre = track.Genre,
				Name = track.Name
			});
		}

		private class Track {
			public string Album { get; set; }
			public string Artist { get; set; }
			public string Genre { get; set; }
			public string Name { get; set; }
		}
	}
}