Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/Modules/Music/_common/Resolvers/TrackResolveProvider.cs

@@ -0,0 +1,49 @@
+namespace NadekoBot.Modules.Music;
+
+public sealed class TrackResolveProvider : ITrackResolveProvider
+{
+    private readonly IYoutubeResolver _ytResolver;
+    private readonly ILocalTrackResolver _localResolver;
+    private readonly IRadioResolver _radioResolver;
+
+    public TrackResolveProvider(
+        IYoutubeResolver ytResolver,
+        ILocalTrackResolver localResolver,
+        IRadioResolver radioResolver)
+    {
+        _ytResolver = ytResolver;
+        _localResolver = localResolver;
+        _radioResolver = radioResolver;
+    }
+
+    public Task<ITrackInfo?> QuerySongAsync(string query, MusicPlatform? forcePlatform)
+    {
+        switch (forcePlatform)
+        {
+            case MusicPlatform.Radio:
+                return _radioResolver.ResolveByQueryAsync(query);
+            case MusicPlatform.Youtube:
+                return _ytResolver.ResolveByQueryAsync(query);
+            case MusicPlatform.Local:
+                return _localResolver.ResolveByQueryAsync(query);
+            case null:
+                var match = _ytResolver.YtVideoIdRegex.Match(query);
+                if (match.Success)
+                    return _ytResolver.ResolveByIdAsync(match.Groups["id"].Value);
+                else if (Uri.TryCreate(query, UriKind.Absolute, out var uri) && uri.IsFile)
+                    return _localResolver.ResolveByQueryAsync(uri.AbsolutePath);
+                else if (IsRadioLink(query))
+                    return _radioResolver.ResolveByQueryAsync(query);
+                else
+                    return _ytResolver.ResolveByQueryAsync(query, false);
+            default:
+                Log.Error("Unsupported platform: {MusicPlatform}", forcePlatform);
+                return Task.FromResult<ITrackInfo?>(null);
+        }
+    }
+
+    public static bool IsRadioLink(string query)
+        => (query.StartsWith("http", StringComparison.InvariantCulture)
+            || query.StartsWith("ww", StringComparison.InvariantCulture))
+           && (query.Contains(".pls") || query.Contains(".m3u") || query.Contains(".asx") || query.Contains(".xspf"));
+}