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  with ID3Tag do begin
    ID:=copy(Buffer,1,3);
    Titel:=copy(Buffer,4,30);
    Artist:=copy(Buffer,34,30);
    Album:=copy(Buffer,64,30);
    Year:=copy(Buffer,94,4);
    Comment:=copy(Buffer,98,30);
    Genre:= ord(Buffer[128]);
  end;//with
    with frmzentral.alvzentral.Items.Add do
    begin
        Caption := id3tag.Titel;
     if id3tag.artist = '' then
     begin
       SubItems.Text := 'xxx';
     end
     else begin
        SubItems.Text:= id3tag.Artist;
     end;
        SubItems.Append(id3tag.Album);
        SubItems.Append(id3tag.Year);
        SubItems.Append(size);
    end;//with                    

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...
if ID3Tag.ID <> 'TAG' then
   ShowMessage('Keine ID3Tags vorhanden!');