diff --git a/lib/src/writers/id3v4_writer.dart b/lib/src/writers/id3v4_writer.dart
index 69b7662..4677cf1 100644
--- a/lib/src/writers/id3v4_writer.dart
+++ b/lib/src/writers/id3v4_writer.dart
@@ -59,9 +59,6 @@ class Id3v4Writer extends BaseMetadataWriter<Mp3Metadata> {
     if (metadata.composer != null) {
       _writeFrame(builder, "TCOM", metadata.composer!);
     }
-    if (metadata.contentType != null) {
-      _writeFrame(builder, "TCON", metadata.contentType!);
-    }
     if (metadata.copyrightMessage != null) {
       _writeFrame(builder, "TCOP", metadata.copyrightMessage!);
     }
@@ -174,7 +171,7 @@ class Id3v4Writer extends BaseMetadataWriter<Mp3Metadata> {
       _writeFrame(builder, "TYER", metadata.year!.toString());
     }
     if (metadata.genres.isNotEmpty) {
-      final genresString = metadata.genres.join('/');
+      final genresString = metadata.genres.join(';');
       _writeFrame(builder, "TCON", genresString);
     } else if (metadata.contentType != null) {
       _writeFrame(builder, "TCON", metadata.contentType!);